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Finding the Fourth Proportional to 78,488.85, 117,696.18 and 28,534.13

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Solution

The fourth proportional to 78,488.85, 117,696.18 and 28,534.13 is: 42,787.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,488.85 : 117,696.18 = 28,534.13 : x
  2. Step 2: Convert to fraction form
    78,488.85/117,696.18 = 28,534.13/x
  3. Step 3: Cross multiply
    78,488.85x = 117,696.18 × 28,534.13
  4. Step 4: Simplify right side
    78,488.85x = 3,358,357,957.95
  5. Step 5: Solve for x
    x = 3,358,357,957.95/78,488.85
  6. Step 6: Final answer
    x = 42,787.71

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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.