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Finding the Fourth Proportional to 439.28, 655.30 and 417.68

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Solution

The fourth proportional to 439.28, 655.30 and 417.68 is: 623.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.28 : 655.30 = 417.68 : x
  2. Step 2: Convert to fraction form
    439.28/655.30 = 417.68/x
  3. Step 3: Cross multiply
    439.28x = 655.30 × 417.68
  4. Step 4: Simplify right side
    439.28x = 273,705.70
  5. Step 5: Solve for x
    x = 273,705.70/439.28
  6. Step 6: Final answer
    x = 623.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.