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Finding the Fourth Proportional to 679.85, 938.19 and 400.04

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Solution

The fourth proportional to 679.85, 938.19 and 400.04 is: 552.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.85 : 938.19 = 400.04 : x
  2. Step 2: Convert to fraction form
    679.85/938.19 = 400.04/x
  3. Step 3: Cross multiply
    679.85x = 938.19 × 400.04
  4. Step 4: Simplify right side
    679.85x = 375,313.53
  5. Step 5: Solve for x
    x = 375,313.53/679.85
  6. Step 6: Final answer
    x = 552.05

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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.