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Finding the Fourth Proportional to 121,064.40, 181,985.40 and 86,245.20

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Solution

The fourth proportional to 121,064.40, 181,985.40 and 86,245.20 is: 129,644.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,064.40 : 181,985.40 = 86,245.20 : x
  2. Step 2: Convert to fraction form
    121,064.40/181,985.40 = 86,245.20/x
  3. Step 3: Cross multiply
    121,064.40x = 181,985.40 × 86,245.20
  4. Step 4: Simplify right side
    121,064.40x = 15,695,367,220.08
  5. Step 5: Solve for x
    x = 15,695,367,220.08/121,064.40
  6. Step 6: Final answer
    x = 129,644.78

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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.