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Finding the Fourth Proportional to 881.80, 1,322.70 and 516.40

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Solution

The fourth proportional to 881.80, 1,322.70 and 516.40 is: 774.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.80 : 1,322.70 = 516.40 : x
  2. Step 2: Convert to fraction form
    881.80/1,322.70 = 516.40/x
  3. Step 3: Cross multiply
    881.80x = 1,322.70 × 516.40
  4. Step 4: Simplify right side
    881.80x = 683,042.28
  5. Step 5: Solve for x
    x = 683,042.28/881.80
  6. Step 6: Final answer
    x = 774.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.