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Finding the Fourth Proportional to 91,811.40, 137,717.10 and 83,646.60

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Solution

The fourth proportional to 91,811.40, 137,717.10 and 83,646.60 is: 125,469.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,811.40 : 137,717.10 = 83,646.60 : x
  2. Step 2: Convert to fraction form
    91,811.40/137,717.10 = 83,646.60/x
  3. Step 3: Cross multiply
    91,811.40x = 137,717.10 × 83,646.60
  4. Step 4: Simplify right side
    91,811.40x = 11,519,567,176.86
  5. Step 5: Solve for x
    x = 11,519,567,176.86/91,811.40
  6. Step 6: Final answer
    x = 125,469.90

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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.