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Finding the Fourth Proportional to 135,400.40, 186,793.72 and 81,655.55

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Solution

The fourth proportional to 135,400.40, 186,793.72 and 81,655.55 is: 112,649.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,400.40 : 186,793.72 = 81,655.55 : x
  2. Step 2: Convert to fraction form
    135,400.40/186,793.72 = 81,655.55/x
  3. Step 3: Cross multiply
    135,400.40x = 186,793.72 × 81,655.55
  4. Step 4: Simplify right side
    135,400.40x = 15,252,743,943.15
  5. Step 5: Solve for x
    x = 15,252,743,943.15/135,400.40
  6. Step 6: Final answer
    x = 112,649.18

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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.