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Finding the Fourth Proportional to 633.15, 871.16 and 618.57

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Solution

The fourth proportional to 633.15, 871.16 and 618.57 is: 851.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    633.15 : 871.16 = 618.57 : x
  2. Step 2: Convert to fraction form
    633.15/871.16 = 618.57/x
  3. Step 3: Cross multiply
    633.15x = 871.16 × 618.57
  4. Step 4: Simplify right side
    633.15x = 538,870.35
  5. Step 5: Solve for x
    x = 538,870.35/633.15
  6. Step 6: Final answer
    x = 851.09

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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.