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Finding the Fourth Proportional to 552.80, 823.20 and 538.40

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Solution

The fourth proportional to 552.80, 823.20 and 538.40 is: 801.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    552.80 : 823.20 = 538.40 : x
  2. Step 2: Convert to fraction form
    552.80/823.20 = 538.40/x
  3. Step 3: Cross multiply
    552.80x = 823.20 × 538.40
  4. Step 4: Simplify right side
    552.80x = 443,210.88
  5. Step 5: Solve for x
    x = 443,210.88/552.80
  6. Step 6: Final answer
    x = 801.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.