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Finding the Fourth Proportional to 121,851.20, 182,776.80 and 86,421.80

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Solution

The fourth proportional to 121,851.20, 182,776.80 and 86,421.80 is: 129,632.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,851.20 : 182,776.80 = 86,421.80 : x
  2. Step 2: Convert to fraction form
    121,851.20/182,776.80 = 86,421.80/x
  3. Step 3: Cross multiply
    121,851.20x = 182,776.80 × 86,421.80
  4. Step 4: Simplify right side
    121,851.20x = 15,795,900,054.24
  5. Step 5: Solve for x
    x = 15,795,900,054.24/121,851.20
  6. Step 6: Final answer
    x = 129,632.70

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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.