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Finding the Fourth Proportional to 822.15, 1,134.73 and 542.40

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Solution

The fourth proportional to 822.15, 1,134.73 and 542.40 is: 748.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.15 : 1,134.73 = 542.40 : x
  2. Step 2: Convert to fraction form
    822.15/1,134.73 = 542.40/x
  3. Step 3: Cross multiply
    822.15x = 1,134.73 × 542.40
  4. Step 4: Simplify right side
    822.15x = 615,475.50
  5. Step 5: Solve for x
    x = 615,475.50/822.15
  6. Step 6: Final answer
    x = 748.62

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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.