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Finding the Fourth Proportional to 871.59, 1,308.02 and 666.75

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Solution

The fourth proportional to 871.59, 1,308.02 and 666.75 is: 1,000.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.59 : 1,308.02 = 666.75 : x
  2. Step 2: Convert to fraction form
    871.59/1,308.02 = 666.75/x
  3. Step 3: Cross multiply
    871.59x = 1,308.02 × 666.75
  4. Step 4: Simplify right side
    871.59x = 872,122.34
  5. Step 5: Solve for x
    x = 872,122.34/871.59
  6. Step 6: Final answer
    x = 1,000.61

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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.