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Finding the Fourth Proportional to 279,836.78, 386,188.45 and 157,367.70

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Solution

The fourth proportional to 279,836.78, 386,188.45 and 157,367.70 is: 217,175.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,836.78 : 386,188.45 = 157,367.70 : x
  2. Step 2: Convert to fraction form
    279,836.78/386,188.45 = 157,367.70/x
  3. Step 3: Cross multiply
    279,836.78x = 386,188.45 × 157,367.70
  4. Step 4: Simplify right side
    279,836.78x = 60,773,588,143.07
  5. Step 5: Solve for x
    x = 60,773,588,143.07/279,836.78
  6. Step 6: Final answer
    x = 217,175.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.