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Finding the Fourth Proportional to 1,101.08, 1,521.40 and 866.90

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Solution

The fourth proportional to 1,101.08, 1,521.40 and 866.90 is: 1,197.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,101.08 : 1,521.40 = 866.90 : x
  2. Step 2: Convert to fraction form
    1,101.08/1,521.40 = 866.90/x
  3. Step 3: Cross multiply
    1,101.08x = 1,521.40 × 866.90
  4. Step 4: Simplify right side
    1,101.08x = 1,318,894.05
  5. Step 5: Solve for x
    x = 1,318,894.05/1,101.08
  6. Step 6: Final answer
    x = 1,197.82

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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.