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Finding the Fourth Proportional to 123,613.80, 185,420.70 and 61,405.80

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Solution

The fourth proportional to 123,613.80, 185,420.70 and 61,405.80 is: 92,108.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,613.80 : 185,420.70 = 61,405.80 : x
  2. Step 2: Convert to fraction form
    123,613.80/185,420.70 = 61,405.80/x
  3. Step 3: Cross multiply
    123,613.80x = 185,420.70 × 61,405.80
  4. Step 4: Simplify right side
    123,613.80x = 11,385,906,420.06
  5. Step 5: Solve for x
    x = 11,385,906,420.06/123,613.80
  6. Step 6: Final answer
    x = 92,108.70

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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.