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Finding the Fourth Proportional to 42,560, 63,840 and 13,376

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Solution

The fourth proportional to 42,560, 63,840 and 13,376 is: 20,064

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,560 : 63,840 = 13,376 : x
  2. Step 2: Convert to fraction form
    42,560/63,840 = 13,376/x
  3. Step 3: Cross multiply
    42,560x = 63,840 × 13,376
  4. Step 4: Simplify right side
    42,560x = 853,923,840
  5. Step 5: Solve for x
    x = 853,923,840/42,560
  6. Step 6: Final answer
    x = 20,064

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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.