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Finding the Fourth Proportional to 78,680.79, 117,881.25 and 45,331.95

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Solution

The fourth proportional to 78,680.79, 117,881.25 and 45,331.95 is: 67,917.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,680.79 : 117,881.25 = 45,331.95 : x
  2. Step 2: Convert to fraction form
    78,680.79/117,881.25 = 45,331.95/x
  3. Step 3: Cross multiply
    78,680.79x = 117,881.25 × 45,331.95
  4. Step 4: Simplify right side
    78,680.79x = 5,343,786,930.94
  5. Step 5: Solve for x
    x = 5,343,786,930.94/78,680.79
  6. Step 6: Final answer
    x = 67,917.30

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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.