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Finding the Fourth Proportional to 871.12, 1,202.61 and 671.52

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Solution

The fourth proportional to 871.12, 1,202.61 and 671.52 is: 927.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.12 : 1,202.61 = 671.52 : x
  2. Step 2: Convert to fraction form
    871.12/1,202.61 = 671.52/x
  3. Step 3: Cross multiply
    871.12x = 1,202.61 × 671.52
  4. Step 4: Simplify right side
    871.12x = 807,573.55
  5. Step 5: Solve for x
    x = 807,573.55/871.12
  6. Step 6: Final answer
    x = 927.05

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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.