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Finding the Fourth Proportional to 397.71, 549.09 and 315.18

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Solution

The fourth proportional to 397.71, 549.09 and 315.18 is: 435.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.71 : 549.09 = 315.18 : x
  2. Step 2: Convert to fraction form
    397.71/549.09 = 315.18/x
  3. Step 3: Cross multiply
    397.71x = 549.09 × 315.18
  4. Step 4: Simplify right side
    397.71x = 173,062.19
  5. Step 5: Solve for x
    x = 173,062.19/397.71
  6. Step 6: Final answer
    x = 435.15

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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.