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Finding the Fourth Proportional to 91,817.60, 137,434.80 and 84,819.20

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Solution

The fourth proportional to 91,817.60, 137,434.80 and 84,819.20 is: 126,959.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,817.60 : 137,434.80 = 84,819.20 : x
  2. Step 2: Convert to fraction form
    91,817.60/137,434.80 = 84,819.20/x
  3. Step 3: Cross multiply
    91,817.60x = 137,434.80 × 84,819.20
  4. Step 4: Simplify right side
    91,817.60x = 11,657,109,788.16
  5. Step 5: Solve for x
    x = 11,657,109,788.16/91,817.60
  6. Step 6: Final answer
    x = 126,959.43

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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.