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Finding the Fourth Proportional to 417.21, 574.69 and 318.80

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Solution

The fourth proportional to 417.21, 574.69 and 318.80 is: 439.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.21 : 574.69 = 318.80 : x
  2. Step 2: Convert to fraction form
    417.21/574.69 = 318.80/x
  3. Step 3: Cross multiply
    417.21x = 574.69 × 318.80
  4. Step 4: Simplify right side
    417.21x = 183,211.17
  5. Step 5: Solve for x
    x = 183,211.17/417.21
  6. Step 6: Final answer
    x = 439.13

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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.