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Finding the Fourth Proportional to 916.20, 1,375.11 and 638.51

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Solution

The fourth proportional to 916.20, 1,375.11 and 638.51 is: 958.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.20 : 1,375.11 = 638.51 : x
  2. Step 2: Convert to fraction form
    916.20/1,375.11 = 638.51/x
  3. Step 3: Cross multiply
    916.20x = 1,375.11 × 638.51
  4. Step 4: Simplify right side
    916.20x = 878,014.61
  5. Step 5: Solve for x
    x = 878,014.61/916.20
  6. Step 6: Final answer
    x = 958.32

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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.