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Finding the Fourth Proportional to 287,590.29, 431,386.50 and 87,909.90

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Solution

The fourth proportional to 287,590.29, 431,386.50 and 87,909.90 is: 131,865.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,590.29 : 431,386.50 = 87,909.90 : x
  2. Step 2: Convert to fraction form
    287,590.29/431,386.50 = 87,909.90/x
  3. Step 3: Cross multiply
    287,590.29x = 431,386.50 × 87,909.90
  4. Step 4: Simplify right side
    287,590.29x = 37,923,144,076.35
  5. Step 5: Solve for x
    x = 37,923,144,076.35/287,590.29
  6. Step 6: Final answer
    x = 131,865.18

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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.