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Finding the Fourth Proportional to 287,591.70, 431,387.55 and 77,250.90

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Solution

The fourth proportional to 287,591.70, 431,387.55 and 77,250.90 is: 115,876.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,591.70 : 431,387.55 = 77,250.90 : x
  2. Step 2: Convert to fraction form
    287,591.70/431,387.55 = 77,250.90/x
  3. Step 3: Cross multiply
    287,591.70x = 431,387.55 × 77,250.90
  4. Step 4: Simplify right side
    287,591.70x = 33,325,076,486.30
  5. Step 5: Solve for x
    x = 33,325,076,486.30/287,591.70
  6. Step 6: Final answer
    x = 115,876.35

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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.