Home / 121,118.10-181,709.55-86,126.10

Finding the Fourth Proportional to 121,118.10, 181,709.55 and 86,126.10

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Solution

The fourth proportional to 121,118.10, 181,709.55 and 86,126.10 is: 129,212.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,118.10 : 181,709.55 = 86,126.10 : x
  2. Step 2: Convert to fraction form
    121,118.10/181,709.55 = 86,126.10/x
  3. Step 3: Cross multiply
    121,118.10x = 181,709.55 × 86,126.10
  4. Step 4: Simplify right side
    121,118.10x = 15,649,934,874.26
  5. Step 5: Solve for x
    x = 15,649,934,874.26/121,118.10
  6. Step 6: Final answer
    x = 129,212.19

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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.