Home / 129,447.55-178,545.59-86,405.33

Finding the Fourth Proportional to 129,447.55, 178,545.59 and 86,405.33

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Solution

The fourth proportional to 129,447.55, 178,545.59 and 86,405.33 is: 119,177.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,447.55 : 178,545.59 = 86,405.33 : x
  2. Step 2: Convert to fraction form
    129,447.55/178,545.59 = 86,405.33/x
  3. Step 3: Cross multiply
    129,447.55x = 178,545.59 × 86,405.33
  4. Step 4: Simplify right side
    129,447.55x = 15,427,290,191.97
  5. Step 5: Solve for x
    x = 15,427,290,191.97/129,447.55
  6. Step 6: Final answer
    x = 119,177.93

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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.