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Finding the Fourth Proportional to 1,534.50, 2,117.12 and 871.11

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Solution

The fourth proportional to 1,534.50, 2,117.12 and 871.11 is: 1,201.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,534.50 : 2,117.12 = 871.11 : x
  2. Step 2: Convert to fraction form
    1,534.50/2,117.12 = 871.11/x
  3. Step 3: Cross multiply
    1,534.50x = 2,117.12 × 871.11
  4. Step 4: Simplify right side
    1,534.50x = 1,844,240.05
  5. Step 5: Solve for x
    x = 1,844,240.05/1,534.50
  6. Step 6: Final answer
    x = 1,201.85

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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.