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Finding the Fourth Proportional to 121,418.60, 182,127.90 and 79,428.20

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Solution

The fourth proportional to 121,418.60, 182,127.90 and 79,428.20 is: 119,142.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,418.60 : 182,127.90 = 79,428.20 : x
  2. Step 2: Convert to fraction form
    121,418.60/182,127.90 = 79,428.20/x
  3. Step 3: Cross multiply
    121,418.60x = 182,127.90 × 79,428.20
  4. Step 4: Simplify right side
    121,418.60x = 14,466,091,266.78
  5. Step 5: Solve for x
    x = 14,466,091,266.78/121,418.60
  6. Step 6: Final answer
    x = 119,142.30

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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.