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Finding the Fourth Proportional to 723.91, 1,087.33 and 639.16

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Solution

The fourth proportional to 723.91, 1,087.33 and 639.16 is: 960.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.91 : 1,087.33 = 639.16 : x
  2. Step 2: Convert to fraction form
    723.91/1,087.33 = 639.16/x
  3. Step 3: Cross multiply
    723.91x = 1,087.33 × 639.16
  4. Step 4: Simplify right side
    723.91x = 694,977.84
  5. Step 5: Solve for x
    x = 694,977.84/723.91
  6. Step 6: Final answer
    x = 960.03

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