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Finding the Fourth Proportional to 628.97, 867.98 and 393.05

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Solution

The fourth proportional to 628.97, 867.98 and 393.05 is: 542.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.97 : 867.98 = 393.05 : x
  2. Step 2: Convert to fraction form
    628.97/867.98 = 393.05/x
  3. Step 3: Cross multiply
    628.97x = 867.98 × 393.05
  4. Step 4: Simplify right side
    628.97x = 341,161.29
  5. Step 5: Solve for x
    x = 341,161.29/628.97
  6. Step 6: Final answer
    x = 542.41

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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.