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Finding the Fourth Proportional to 57,632, 86,448 and 18,720

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Solution

The fourth proportional to 57,632, 86,448 and 18,720 is: 28,080

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,632 : 86,448 = 18,720 : x
  2. Step 2: Convert to fraction form
    57,632/86,448 = 18,720/x
  3. Step 3: Cross multiply
    57,632x = 86,448 × 18,720
  4. Step 4: Simplify right side
    57,632x = 1,618,306,560
  5. Step 5: Solve for x
    x = 1,618,306,560/57,632
  6. Step 6: Final answer
    x = 28,080

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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.