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Finding the Fourth Proportional to 542.72, 812.64 and 380.48

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Solution

The fourth proportional to 542.72, 812.64 and 380.48 is: 569.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.72 : 812.64 = 380.48 : x
  2. Step 2: Convert to fraction form
    542.72/812.64 = 380.48/x
  3. Step 3: Cross multiply
    542.72x = 812.64 × 380.48
  4. Step 4: Simplify right side
    542.72x = 309,193.27
  5. Step 5: Solve for x
    x = 309,193.27/542.72
  6. Step 6: Final answer
    x = 569.71

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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.