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Finding the Fourth Proportional to 287,539.90, 431,387.47 and 87,854.83

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Solution

The fourth proportional to 287,539.90, 431,387.47 and 87,854.83 is: 131,805.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,539.90 : 431,387.47 = 87,854.83 : x
  2. Step 2: Convert to fraction form
    287,539.90/431,387.47 = 87,854.83/x
  3. Step 3: Cross multiply
    287,539.90x = 431,387.47 × 87,854.83
  4. Step 4: Simplify right side
    287,539.90x = 37,899,471,872.33
  5. Step 5: Solve for x
    x = 37,899,471,872.33/287,539.90
  6. Step 6: Final answer
    x = 131,805.96

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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.