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Finding the Fourth Proportional to 139,613.40, 209,420.10 and 86,469.30

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Solution

The fourth proportional to 139,613.40, 209,420.10 and 86,469.30 is: 129,703.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,613.40 : 209,420.10 = 86,469.30 : x
  2. Step 2: Convert to fraction form
    139,613.40/209,420.10 = 86,469.30/x
  3. Step 3: Cross multiply
    139,613.40x = 209,420.10 × 86,469.30
  4. Step 4: Simplify right side
    139,613.40x = 18,108,409,452.93
  5. Step 5: Solve for x
    x = 18,108,409,452.93/139,613.40
  6. Step 6: Final answer
    x = 129,703.95

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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.