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Finding the Fourth Proportional to 128,854.68, 177,766.96 and 86,426.88

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Solution

The fourth proportional to 128,854.68, 177,766.96 and 86,426.88 is: 119,233.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,854.68 : 177,766.96 = 86,426.88 : x
  2. Step 2: Convert to fraction form
    128,854.68/177,766.96 = 86,426.88/x
  3. Step 3: Cross multiply
    128,854.68x = 177,766.96 × 86,426.88
  4. Step 4: Simplify right side
    128,854.68x = 15,363,843,719.88
  5. Step 5: Solve for x
    x = 15,363,843,719.88/128,854.68
  6. Step 6: Final answer
    x = 119,233.88

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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.