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Finding the Fourth Proportional to 821,663.80, 1,232,495.70 and 260,698.30

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Solution

The fourth proportional to 821,663.80, 1,232,495.70 and 260,698.30 is: 391,047.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    821,663.80 : 1,232,495.70 = 260,698.30 : x
  2. Step 2: Convert to fraction form
    821,663.80/1,232,495.70 = 260,698.30/x
  3. Step 3: Cross multiply
    821,663.80x = 1,232,495.70 × 260,698.30
  4. Step 4: Simplify right side
    821,663.80x = 321,309,533,747.31
  5. Step 5: Solve for x
    x = 321,309,533,747.31/821,663.80
  6. Step 6: Final answer
    x = 391,047.45

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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.