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Finding the Fourth Proportional to 91,859.60, 137,789.40 and 52,420.70

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Solution

The fourth proportional to 91,859.60, 137,789.40 and 52,420.70 is: 78,631.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,859.60 : 137,789.40 = 52,420.70 : x
  2. Step 2: Convert to fraction form
    91,859.60/137,789.40 = 52,420.70/x
  3. Step 3: Cross multiply
    91,859.60x = 137,789.40 × 52,420.70
  4. Step 4: Simplify right side
    91,859.60x = 7,223,016,800.58
  5. Step 5: Solve for x
    x = 7,223,016,800.58/91,859.60
  6. Step 6: Final answer
    x = 78,631.05

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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.