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Finding the Fourth Proportional to 939.48, 1,297.04 and 645.18

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Solution

The fourth proportional to 939.48, 1,297.04 and 645.18 is: 890.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.48 : 1,297.04 = 645.18 : x
  2. Step 2: Convert to fraction form
    939.48/1,297.04 = 645.18/x
  3. Step 3: Cross multiply
    939.48x = 1,297.04 × 645.18
  4. Step 4: Simplify right side
    939.48x = 836,824.27
  5. Step 5: Solve for x
    x = 836,824.27/939.48
  6. Step 6: Final answer
    x = 890.73

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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.