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Finding the Fourth Proportional to 91,720.80, 137,386.80 and 76,168.80

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Solution

The fourth proportional to 91,720.80, 137,386.80 and 76,168.80 is: 114,091.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,720.80 : 137,386.80 = 76,168.80 : x
  2. Step 2: Convert to fraction form
    91,720.80/137,386.80 = 76,168.80/x
  3. Step 3: Cross multiply
    91,720.80x = 137,386.80 × 76,168.80
  4. Step 4: Simplify right side
    91,720.80x = 10,464,587,691.84
  5. Step 5: Solve for x
    x = 10,464,587,691.84/91,720.80
  6. Step 6: Final answer
    x = 114,091.76

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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.