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Finding the Fourth Proportional to 415.92, 622.92 and 278.76

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Solution

The fourth proportional to 415.92, 622.92 and 278.76 is: 417.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.92 : 622.92 = 278.76 : x
  2. Step 2: Convert to fraction form
    415.92/622.92 = 278.76/x
  3. Step 3: Cross multiply
    415.92x = 622.92 × 278.76
  4. Step 4: Simplify right side
    415.92x = 173,645.18
  5. Step 5: Solve for x
    x = 173,645.18/415.92
  6. Step 6: Final answer
    x = 417.50

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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.