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Finding the Fourth Proportional to 78,618.39, 117,935.88 and 45,337.71

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Solution

The fourth proportional to 78,618.39, 117,935.88 and 45,337.71 is: 68,011.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,618.39 : 117,935.88 = 45,337.71 : x
  2. Step 2: Convert to fraction form
    78,618.39/117,935.88 = 45,337.71/x
  3. Step 3: Cross multiply
    78,618.39x = 117,935.88 × 45,337.71
  4. Step 4: Simplify right side
    78,618.39x = 5,346,942,726.03
  5. Step 5: Solve for x
    x = 5,346,942,726.03/78,618.39
  6. Step 6: Final answer
    x = 68,011.35

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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.