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Finding the Fourth Proportional to 1,110.80, 1,532.80 and 645.04

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Solution

The fourth proportional to 1,110.80, 1,532.80 and 645.04 is: 890.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,110.80 : 1,532.80 = 645.04 : x
  2. Step 2: Convert to fraction form
    1,110.80/1,532.80 = 645.04/x
  3. Step 3: Cross multiply
    1,110.80x = 1,532.80 × 645.04
  4. Step 4: Simplify right side
    1,110.80x = 988,717.31
  5. Step 5: Solve for x
    x = 988,717.31/1,110.80
  6. Step 6: Final answer
    x = 890.09

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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.