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Finding the Fourth Proportional to 279,840.80, 386,193.96 and 157,371.72

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Solution

The fourth proportional to 279,840.80, 386,193.96 and 157,371.72 is: 217,180.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,840.80 : 386,193.96 = 157,371.72 : x
  2. Step 2: Convert to fraction form
    279,840.80/386,193.96 = 157,371.72/x
  3. Step 3: Cross multiply
    279,840.80x = 386,193.96 × 157,371.72
  4. Step 4: Simplify right side
    279,840.80x = 60,776,007,738.81
  5. Step 5: Solve for x
    x = 60,776,007,738.81/279,840.80
  6. Step 6: Final answer
    x = 217,180.65

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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.