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Finding the Fourth Proportional to 128,097.18, 176,789.64 and 74,382.18

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Solution

The fourth proportional to 128,097.18, 176,789.64 and 74,382.18 is: 102,656.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,097.18 : 176,789.64 = 74,382.18 : x
  2. Step 2: Convert to fraction form
    128,097.18/176,789.64 = 74,382.18/x
  3. Step 3: Cross multiply
    128,097.18x = 176,789.64 × 74,382.18
  4. Step 4: Simplify right side
    128,097.18x = 13,149,998,824.62
  5. Step 5: Solve for x
    x = 13,149,998,824.62/128,097.18
  6. Step 6: Final answer
    x = 102,656.43

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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.