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Finding the Fourth Proportional to 128,325.52, 177,086.28 and 71,742.16

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Solution

The fourth proportional to 128,325.52, 177,086.28 and 71,742.16 is: 99,002.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,325.52 : 177,086.28 = 71,742.16 : x
  2. Step 2: Convert to fraction form
    128,325.52/177,086.28 = 71,742.16/x
  3. Step 3: Cross multiply
    128,325.52x = 177,086.28 × 71,742.16
  4. Step 4: Simplify right side
    128,325.52x = 12,704,552,233.56
  5. Step 5: Solve for x
    x = 12,704,552,233.56/128,325.52
  6. Step 6: Final answer
    x = 99,002.54

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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.