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Finding the Fourth Proportional to 714.95, 1,072.41 and 440.20

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Solution

The fourth proportional to 714.95, 1,072.41 and 440.20 is: 660.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.95 : 1,072.41 = 440.20 : x
  2. Step 2: Convert to fraction form
    714.95/1,072.41 = 440.20/x
  3. Step 3: Cross multiply
    714.95x = 1,072.41 × 440.20
  4. Step 4: Simplify right side
    714.95x = 472,074.88
  5. Step 5: Solve for x
    x = 472,074.88/714.95
  6. Step 6: Final answer
    x = 660.29

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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.