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Finding the Fourth Proportional to 279,145.95, 418,891.16 and 129,358.32

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Solution

The fourth proportional to 279,145.95, 418,891.16 and 129,358.32 is: 194,117.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,145.95 : 418,891.16 = 129,358.32 : x
  2. Step 2: Convert to fraction form
    279,145.95/418,891.16 = 129,358.32/x
  3. Step 3: Cross multiply
    279,145.95x = 418,891.16 × 129,358.32
  4. Step 4: Simplify right side
    279,145.95x = 54,187,059,007.40
  5. Step 5: Solve for x
    x = 54,187,059,007.40/279,145.95
  6. Step 6: Final answer
    x = 194,117.30

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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.