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Finding the Fourth Proportional to 679.84, 938.02 and 400.12

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Solution

The fourth proportional to 679.84, 938.02 and 400.12 is: 552.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.84 : 938.02 = 400.12 : x
  2. Step 2: Convert to fraction form
    679.84/938.02 = 400.12/x
  3. Step 3: Cross multiply
    679.84x = 938.02 × 400.12
  4. Step 4: Simplify right side
    679.84x = 375,320.56
  5. Step 5: Solve for x
    x = 375,320.56/679.84
  6. Step 6: Final answer
    x = 552.07

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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.