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Finding the Fourth Proportional to 822.64, 1,134.92 and 818.98

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Solution

The fourth proportional to 822.64, 1,134.92 and 818.98 is: 1,129.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.64 : 1,134.92 = 818.98 : x
  2. Step 2: Convert to fraction form
    822.64/1,134.92 = 818.98/x
  3. Step 3: Cross multiply
    822.64x = 1,134.92 × 818.98
  4. Step 4: Simplify right side
    822.64x = 929,476.78
  5. Step 5: Solve for x
    x = 929,476.78/822.64
  6. Step 6: Final answer
    x = 1,129.87

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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.