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Finding the Fourth Proportional to 417.76, 626.04 and 280.96

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Solution

The fourth proportional to 417.76, 626.04 and 280.96 is: 421.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.76 : 626.04 = 280.96 : x
  2. Step 2: Convert to fraction form
    417.76/626.04 = 280.96/x
  3. Step 3: Cross multiply
    417.76x = 626.04 × 280.96
  4. Step 4: Simplify right side
    417.76x = 175,892.20
  5. Step 5: Solve for x
    x = 175,892.20/417.76
  6. Step 6: Final answer
    x = 421.04

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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.