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Finding the Fourth Proportional to 417.42, 574.90 and 391.91

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Solution

The fourth proportional to 417.42, 574.90 and 391.91 is: 539.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.42 : 574.90 = 391.91 : x
  2. Step 2: Convert to fraction form
    417.42/574.90 = 391.91/x
  3. Step 3: Cross multiply
    417.42x = 574.90 × 391.91
  4. Step 4: Simplify right side
    417.42x = 225,305.20
  5. Step 5: Solve for x
    x = 225,305.20/417.42
  6. Step 6: Final answer
    x = 539.76

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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.