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Finding the Fourth Proportional to 828, 1,142.88 and 552

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Solution

The fourth proportional to 828, 1,142.88 and 552 is: 761.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    828 : 1,142.88 = 552 : x
  2. Step 2: Convert to fraction form
    828/1,142.88 = 552/x
  3. Step 3: Cross multiply
    828x = 1,142.88 × 552
  4. Step 4: Simplify right side
    828x = 630,869.76
  5. Step 5: Solve for x
    x = 630,869.76/828
  6. Step 6: Final answer
    x = 761.92

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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.