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Finding the Fourth Proportional to 1,110.62, 1,532.85 and 644.90

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Solution

The fourth proportional to 1,110.62, 1,532.85 and 644.90 is: 890.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,110.62 : 1,532.85 = 644.90 : x
  2. Step 2: Convert to fraction form
    1,110.62/1,532.85 = 644.90/x
  3. Step 3: Cross multiply
    1,110.62x = 1,532.85 × 644.90
  4. Step 4: Simplify right side
    1,110.62x = 988,534.97
  5. Step 5: Solve for x
    x = 988,534.97/1,110.62
  6. Step 6: Final answer
    x = 890.07

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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.