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Finding the Fourth Proportional to 78,810.46, 118,742.17 and 71,324.08

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Solution

The fourth proportional to 78,810.46, 118,742.17 and 71,324.08 is: 107,462.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,810.46 : 118,742.17 = 71,324.08 : x
  2. Step 2: Convert to fraction form
    78,810.46/118,742.17 = 71,324.08/x
  3. Step 3: Cross multiply
    78,810.46x = 118,742.17 × 71,324.08
  4. Step 4: Simplify right side
    78,810.46x = 8,469,176,032.45
  5. Step 5: Solve for x
    x = 8,469,176,032.45/78,810.46
  6. Step 6: Final answer
    x = 107,462.59

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.