Home / 128,545.60-192,818.40-86,555.20

Finding the Fourth Proportional to 128,545.60, 192,818.40 and 86,555.20

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Solution

The fourth proportional to 128,545.60, 192,818.40 and 86,555.20 is: 129,832.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,545.60 : 192,818.40 = 86,555.20 : x
  2. Step 2: Convert to fraction form
    128,545.60/192,818.40 = 86,555.20/x
  3. Step 3: Cross multiply
    128,545.60x = 192,818.40 × 86,555.20
  4. Step 4: Simplify right side
    128,545.60x = 16,689,435,175.68
  5. Step 5: Solve for x
    x = 16,689,435,175.68/128,545.60
  6. Step 6: Final answer
    x = 129,832.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.