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Finding the Fourth Proportional to 816.42, 1,127.61 and 684.12

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Solution

The fourth proportional to 816.42, 1,127.61 and 684.12 is: 944.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.42 : 1,127.61 = 684.12 : x
  2. Step 2: Convert to fraction form
    816.42/1,127.61 = 684.12/x
  3. Step 3: Cross multiply
    816.42x = 1,127.61 × 684.12
  4. Step 4: Simplify right side
    816.42x = 771,420.55
  5. Step 5: Solve for x
    x = 771,420.55/816.42
  6. Step 6: Final answer
    x = 944.88

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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.