Home / 515,947.40-773,921.10-389,976.20

Finding the Fourth Proportional to 515,947.40, 773,921.10 and 389,976.20

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Solution

The fourth proportional to 515,947.40, 773,921.10 and 389,976.20 is: 584,964.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,947.40 : 773,921.10 = 389,976.20 : x
  2. Step 2: Convert to fraction form
    515,947.40/773,921.10 = 389,976.20/x
  3. Step 3: Cross multiply
    515,947.40x = 773,921.10 × 389,976.20
  4. Step 4: Simplify right side
    515,947.40x = 301,810,809,677.82
  5. Step 5: Solve for x
    x = 301,810,809,677.82/515,947.40
  6. Step 6: Final answer
    x = 584,964.30

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.