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Finding the Fourth Proportional to 395.30, 549.17 and 391.74

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Solution

The fourth proportional to 395.30, 549.17 and 391.74 is: 544.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.30 : 549.17 = 391.74 : x
  2. Step 2: Convert to fraction form
    395.30/549.17 = 391.74/x
  3. Step 3: Cross multiply
    395.30x = 549.17 × 391.74
  4. Step 4: Simplify right side
    395.30x = 215,131.86
  5. Step 5: Solve for x
    x = 215,131.86/395.30
  6. Step 6: Final answer
    x = 544.22

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.