Home / 121,115.10-181,705.05-86,123.10

Finding the Fourth Proportional to 121,115.10, 181,705.05 and 86,123.10

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Solution

The fourth proportional to 121,115.10, 181,705.05 and 86,123.10 is: 129,207.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,115.10 : 181,705.05 = 86,123.10 : x
  2. Step 2: Convert to fraction form
    121,115.10/181,705.05 = 86,123.10/x
  3. Step 3: Cross multiply
    121,115.10x = 181,705.05 × 86,123.10
  4. Step 4: Simplify right side
    121,115.10x = 15,649,002,191.66
  5. Step 5: Solve for x
    x = 15,649,002,191.66/121,115.10
  6. Step 6: Final answer
    x = 129,207.69

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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.