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Finding the Fourth Proportional to 679.68, 938.88 and 622.08

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Solution

The fourth proportional to 679.68, 938.88 and 622.08 is: 859.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.68 : 938.88 = 622.08 : x
  2. Step 2: Convert to fraction form
    679.68/938.88 = 622.08/x
  3. Step 3: Cross multiply
    679.68x = 938.88 × 622.08
  4. Step 4: Simplify right side
    679.68x = 584,058.47
  5. Step 5: Solve for x
    x = 584,058.47/679.68
  6. Step 6: Final answer
    x = 859.31

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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.