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Finding the Fourth Proportional to 121,119.10, 181,711.05 and 86,127.10

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Solution

The fourth proportional to 121,119.10, 181,711.05 and 86,127.10 is: 129,213.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,119.10 : 181,711.05 = 86,127.10 : x
  2. Step 2: Convert to fraction form
    121,119.10/181,711.05 = 86,127.10/x
  3. Step 3: Cross multiply
    121,119.10x = 181,711.05 × 86,127.10
  4. Step 4: Simplify right side
    121,119.10x = 15,650,245,774.46
  5. Step 5: Solve for x
    x = 15,650,245,774.46/121,119.10
  6. Step 6: Final answer
    x = 129,213.69

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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.