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Finding the Fourth Proportional to 818.24, 1,128.96 and 542.24

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Solution

The fourth proportional to 818.24, 1,128.96 and 542.24 is: 748.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.24 : 1,128.96 = 542.24 : x
  2. Step 2: Convert to fraction form
    818.24/1,128.96 = 542.24/x
  3. Step 3: Cross multiply
    818.24x = 1,128.96 × 542.24
  4. Step 4: Simplify right side
    818.24x = 612,167.27
  5. Step 5: Solve for x
    x = 612,167.27/818.24
  6. Step 6: Final answer
    x = 748.15

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1.5x scale

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.