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Finding the Fourth Proportional to 714.84, 1,072.26 and 391.66

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Solution

The fourth proportional to 714.84, 1,072.26 and 391.66 is: 587.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.84 : 1,072.26 = 391.66 : x
  2. Step 2: Convert to fraction form
    714.84/1,072.26 = 391.66/x
  3. Step 3: Cross multiply
    714.84x = 1,072.26 × 391.66
  4. Step 4: Simplify right side
    714.84x = 419,961.35
  5. Step 5: Solve for x
    x = 419,961.35/714.84
  6. Step 6: Final answer
    x = 587.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.