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Finding the Fourth Proportional to 108,691.68, 149,993.76 and 66,247.68

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Solution

The fourth proportional to 108,691.68, 149,993.76 and 66,247.68 is: 91,421.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,691.68 : 149,993.76 = 66,247.68 : x
  2. Step 2: Convert to fraction form
    108,691.68/149,993.76 = 66,247.68/x
  3. Step 3: Cross multiply
    108,691.68x = 149,993.76 × 66,247.68
  4. Step 4: Simplify right side
    108,691.68x = 9,936,738,614.48
  5. Step 5: Solve for x
    x = 9,936,738,614.48/108,691.68
  6. Step 6: Final answer
    x = 91,421.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.