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Finding the Fourth Proportional to 287,728.20, 431,592.30 and 287,728.20

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Solution

The fourth proportional to 287,728.20, 431,592.30 and 287,728.20 is: 431,592.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,728.20 : 431,592.30 = 287,728.20 : x
  2. Step 2: Convert to fraction form
    287,728.20/431,592.30 = 287,728.20/x
  3. Step 3: Cross multiply
    287,728.20x = 431,592.30 × 287,728.20
  4. Step 4: Simplify right side
    287,728.20x = 124,181,275,612.86
  5. Step 5: Solve for x
    x = 124,181,275,612.86/287,728.20
  6. Step 6: Final answer
    x = 431,592.30

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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.