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Finding the Fourth Proportional to 87,480, 131,220 and 21,816

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Solution

The fourth proportional to 87,480, 131,220 and 21,816 is: 32,724

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,480 : 131,220 = 21,816 : x
  2. Step 2: Convert to fraction form
    87,480/131,220 = 21,816/x
  3. Step 3: Cross multiply
    87,480x = 131,220 × 21,816
  4. Step 4: Simplify right side
    87,480x = 2,862,695,520
  5. Step 5: Solve for x
    x = 2,862,695,520/87,480
  6. Step 6: Final answer
    x = 32,724

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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.