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Finding the Fourth Proportional to 279,139.80, 418,709.70 and 251,146.20

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Solution

The fourth proportional to 279,139.80, 418,709.70 and 251,146.20 is: 376,719.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,139.80 : 418,709.70 = 251,146.20 : x
  2. Step 2: Convert to fraction form
    279,139.80/418,709.70 = 251,146.20/x
  3. Step 3: Cross multiply
    279,139.80x = 418,709.70 × 251,146.20
  4. Step 4: Simplify right side
    279,139.80x = 105,157,350,058.14
  5. Step 5: Solve for x
    x = 105,157,350,058.14/279,139.80
  6. Step 6: Final answer
    x = 376,719.30

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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.