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Finding the Fourth Proportional to 439.42, 655.26 and 417.90

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Solution

The fourth proportional to 439.42, 655.26 and 417.90 is: 623.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.42 : 655.26 = 417.90 : x
  2. Step 2: Convert to fraction form
    439.42/655.26 = 417.90/x
  3. Step 3: Cross multiply
    439.42x = 655.26 × 417.90
  4. Step 4: Simplify right side
    439.42x = 273,833.15
  5. Step 5: Solve for x
    x = 273,833.15/439.42
  6. Step 6: Final answer
    x = 623.17

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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.