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Finding the Fourth Proportional to 638,335.20, 955,659.60 and 389,503.20

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Solution

The fourth proportional to 638,335.20, 955,659.60 and 389,503.20 is: 583,130.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,335.20 : 955,659.60 = 389,503.20 : x
  2. Step 2: Convert to fraction form
    638,335.20/955,659.60 = 389,503.20/x
  3. Step 3: Cross multiply
    638,335.20x = 955,659.60 × 389,503.20
  4. Step 4: Simplify right side
    638,335.20x = 372,232,472,310.72
  5. Step 5: Solve for x
    x = 372,232,472,310.72/638,335.20
  6. Step 6: Final answer
    x = 583,130.11

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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.