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Finding the Fourth Proportional to 91,808.40, 137,712.60 and 87,434.40

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Solution

The fourth proportional to 91,808.40, 137,712.60 and 87,434.40 is: 131,151.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,808.40 : 137,712.60 = 87,434.40 : x
  2. Step 2: Convert to fraction form
    91,808.40/137,712.60 = 87,434.40/x
  3. Step 3: Cross multiply
    91,808.40x = 137,712.60 × 87,434.40
  4. Step 4: Simplify right side
    91,808.40x = 12,040,818,553.44
  5. Step 5: Solve for x
    x = 12,040,818,553.44/91,808.40
  6. Step 6: Final answer
    x = 131,151.60

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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.