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Finding the Fourth Proportional to 91,818.30, 137,727.45 and 78,696.30

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Solution

The fourth proportional to 91,818.30, 137,727.45 and 78,696.30 is: 118,044.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,818.30 : 137,727.45 = 78,696.30 : x
  2. Step 2: Convert to fraction form
    91,818.30/137,727.45 = 78,696.30/x
  3. Step 3: Cross multiply
    91,818.30x = 137,727.45 × 78,696.30
  4. Step 4: Simplify right side
    91,818.30x = 10,838,640,723.44
  5. Step 5: Solve for x
    x = 10,838,640,723.44/91,818.30
  6. Step 6: Final answer
    x = 118,044.45

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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.