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Finding the Fourth Proportional to 1,011.75, 1,396.20 and 871.62

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Solution

The fourth proportional to 1,011.75, 1,396.20 and 871.62 is: 1,202.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.75 : 1,396.20 = 871.62 : x
  2. Step 2: Convert to fraction form
    1,011.75/1,396.20 = 871.62/x
  3. Step 3: Cross multiply
    1,011.75x = 1,396.20 × 871.62
  4. Step 4: Simplify right side
    1,011.75x = 1,216,955.84
  5. Step 5: Solve for x
    x = 1,216,955.84/1,011.75
  6. Step 6: Final answer
    x = 1,202.82

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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.