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Finding the Fourth Proportional to 723.40, 1,084.88 and 312.44

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Solution

The fourth proportional to 723.40, 1,084.88 and 312.44 is: 468.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.40 : 1,084.88 = 312.44 : x
  2. Step 2: Convert to fraction form
    723.40/1,084.88 = 312.44/x
  3. Step 3: Cross multiply
    723.40x = 1,084.88 × 312.44
  4. Step 4: Simplify right side
    723.40x = 338,959.91
  5. Step 5: Solve for x
    x = 338,959.91/723.40
  6. Step 6: Final answer
    x = 468.56

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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.