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Finding the Fourth Proportional to 128,502.10, 192,753.15 and 86,511.70

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Solution

The fourth proportional to 128,502.10, 192,753.15 and 86,511.70 is: 129,767.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,502.10 : 192,753.15 = 86,511.70 : x
  2. Step 2: Convert to fraction form
    128,502.10/192,753.15 = 86,511.70/x
  3. Step 3: Cross multiply
    128,502.10x = 192,753.15 × 86,511.70
  4. Step 4: Simplify right side
    128,502.10x = 16,675,402,686.86
  5. Step 5: Solve for x
    x = 16,675,402,686.86/128,502.10
  6. Step 6: Final answer
    x = 129,767.55

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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.