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Finding the Fourth Proportional to 128,781.78, 177,719.28 and 72,189.50

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Solution

The fourth proportional to 128,781.78, 177,719.28 and 72,189.50 is: 99,621.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,781.78 : 177,719.28 = 72,189.50 : x
  2. Step 2: Convert to fraction form
    128,781.78/177,719.28 = 72,189.50/x
  3. Step 3: Cross multiply
    128,781.78x = 177,719.28 × 72,189.50
  4. Step 4: Simplify right side
    128,781.78x = 12,829,465,963.56
  5. Step 5: Solve for x
    x = 12,829,465,963.56/128,781.78
  6. Step 6: Final answer
    x = 99,621.75

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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.