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Finding the Fourth Proportional to 91,854.40, 137,781.60 and 87,480.40

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Solution

The fourth proportional to 91,854.40, 137,781.60 and 87,480.40 is: 131,220.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,854.40 : 137,781.60 = 87,480.40 : x
  2. Step 2: Convert to fraction form
    91,854.40/137,781.60 = 87,480.40/x
  3. Step 3: Cross multiply
    91,854.40x = 137,781.60 × 87,480.40
  4. Step 4: Simplify right side
    91,854.40x = 12,053,189,480.64
  5. Step 5: Solve for x
    x = 12,053,189,480.64/91,854.40
  6. Step 6: Final answer
    x = 131,220.60

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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.