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Finding the Fourth Proportional to 542.40, 819.12 and 542.40

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Solution

The fourth proportional to 542.40, 819.12 and 542.40 is: 819.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.40 : 819.12 = 542.40 : x
  2. Step 2: Convert to fraction form
    542.40/819.12 = 542.40/x
  3. Step 3: Cross multiply
    542.40x = 819.12 × 542.40
  4. Step 4: Simplify right side
    542.40x = 444,290.69
  5. Step 5: Solve for x
    x = 444,290.69/542.40
  6. Step 6: Final answer
    x = 819.12

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.