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Finding the Fourth Proportional to 679.18, 939.25 and 666.89

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Solution

The fourth proportional to 679.18, 939.25 and 666.89 is: 922.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.18 : 939.25 = 666.89 : x
  2. Step 2: Convert to fraction form
    679.18/939.25 = 666.89/x
  3. Step 3: Cross multiply
    679.18x = 939.25 × 666.89
  4. Step 4: Simplify right side
    679.18x = 626,376.43
  5. Step 5: Solve for x
    x = 626,376.43/679.18
  6. Step 6: Final answer
    x = 922.25

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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.