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Finding the Fourth Proportional to 121,680.67, 182,567.75 and 85,691.67

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Solution

The fourth proportional to 121,680.67, 182,567.75 and 85,691.67 is: 128,570.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,680.67 : 182,567.75 = 85,691.67 : x
  2. Step 2: Convert to fraction form
    121,680.67/182,567.75 = 85,691.67/x
  3. Step 3: Cross multiply
    121,680.67x = 182,567.75 × 85,691.67
  4. Step 4: Simplify right side
    121,680.67x = 15,644,535,385.64
  5. Step 5: Solve for x
    x = 15,644,535,385.64/121,680.67
  6. Step 6: Final answer
    x = 128,570.42

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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.