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Finding the Fourth Proportional to 542.51, 813.86 and 217.70

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Solution

The fourth proportional to 542.51, 813.86 and 217.70 is: 326.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.51 : 813.86 = 217.70 : x
  2. Step 2: Convert to fraction form
    542.51/813.86 = 217.70/x
  3. Step 3: Cross multiply
    542.51x = 813.86 × 217.70
  4. Step 4: Simplify right side
    542.51x = 177,176.23
  5. Step 5: Solve for x
    x = 177,176.23/542.51
  6. Step 6: Final answer
    x = 326.59

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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.