Home / 121,120.10-181,712.55-86,128.10

Finding the Fourth Proportional to 121,120.10, 181,712.55 and 86,128.10

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Solution

The fourth proportional to 121,120.10, 181,712.55 and 86,128.10 is: 129,215.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,120.10 : 181,712.55 = 86,128.10 : x
  2. Step 2: Convert to fraction form
    121,120.10/181,712.55 = 86,128.10/x
  3. Step 3: Cross multiply
    121,120.10x = 181,712.55 × 86,128.10
  4. Step 4: Simplify right side
    121,120.10x = 15,650,556,677.66
  5. Step 5: Solve for x
    x = 15,650,556,677.66/121,120.10
  6. Step 6: Final answer
    x = 129,215.19

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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.