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Finding the Fourth Proportional to 871.76, 1,201.02 and 696.80

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Solution

The fourth proportional to 871.76, 1,201.02 and 696.80 is: 959.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.76 : 1,201.02 = 696.80 : x
  2. Step 2: Convert to fraction form
    871.76/1,201.02 = 696.80/x
  3. Step 3: Cross multiply
    871.76x = 1,201.02 × 696.80
  4. Step 4: Simplify right side
    871.76x = 836,870.74
  5. Step 5: Solve for x
    x = 836,870.74/871.76
  6. Step 6: Final answer
    x = 959.98

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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.