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Finding the Fourth Proportional to 87,354, 131,031 and 21,690

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Solution

The fourth proportional to 87,354, 131,031 and 21,690 is: 32,535

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,354 : 131,031 = 21,690 : x
  2. Step 2: Convert to fraction form
    87,354/131,031 = 21,690/x
  3. Step 3: Cross multiply
    87,354x = 131,031 × 21,690
  4. Step 4: Simplify right side
    87,354x = 2,842,062,390
  5. Step 5: Solve for x
    x = 2,842,062,390/87,354
  6. Step 6: Final answer
    x = 32,535

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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.