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Finding the Fourth Proportional to 731.40, 1,095.84 and 438.72

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Solution

The fourth proportional to 731.40, 1,095.84 and 438.72 is: 657.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.40 : 1,095.84 = 438.72 : x
  2. Step 2: Convert to fraction form
    731.40/1,095.84 = 438.72/x
  3. Step 3: Cross multiply
    731.40x = 1,095.84 × 438.72
  4. Step 4: Simplify right side
    731.40x = 480,766.92
  5. Step 5: Solve for x
    x = 480,766.92/731.40
  6. Step 6: Final answer
    x = 657.32

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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.