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Finding the Fourth Proportional to 542.16, 812.90 and 217.15

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Solution

The fourth proportional to 542.16, 812.90 and 217.15 is: 325.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.16 : 812.90 = 217.15 : x
  2. Step 2: Convert to fraction form
    542.16/812.90 = 217.15/x
  3. Step 3: Cross multiply
    542.16x = 812.90 × 217.15
  4. Step 4: Simplify right side
    542.16x = 176,519.75
  5. Step 5: Solve for x
    x = 176,519.75/542.16
  6. Step 6: Final answer
    x = 325.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.