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Finding the Fourth Proportional to 42,497.71, 63,753.86 and 12,918.49

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Solution

The fourth proportional to 42,497.71, 63,753.86 and 12,918.49 is: 19,379.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,497.71 : 63,753.86 = 12,918.49 : x
  2. Step 2: Convert to fraction form
    42,497.71/63,753.86 = 12,918.49/x
  3. Step 3: Cross multiply
    42,497.71x = 63,753.86 × 12,918.49
  4. Step 4: Simplify right side
    42,497.71x = 823,603,538.28
  5. Step 5: Solve for x
    x = 823,603,538.28/42,497.71
  6. Step 6: Final answer
    x = 19,379.95

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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.