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Finding the Fourth Proportional to 128,122.39, 176,815.61 and 71,530.39

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Solution

The fourth proportional to 128,122.39, 176,815.61 and 71,530.39 is: 98,715.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,122.39 : 176,815.61 = 71,530.39 : x
  2. Step 2: Convert to fraction form
    128,122.39/176,815.61 = 71,530.39/x
  3. Step 3: Cross multiply
    128,122.39x = 176,815.61 × 71,530.39
  4. Step 4: Simplify right side
    128,122.39x = 12,647,689,541.39
  5. Step 5: Solve for x
    x = 12,647,689,541.39/128,122.39
  6. Step 6: Final answer
    x = 98,715.69

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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.