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Finding the Fourth Proportional to 916.22, 1,372.74 and 763.14

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Solution

The fourth proportional to 916.22, 1,372.74 and 763.14 is: 1,143.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.22 : 1,372.74 = 763.14 : x
  2. Step 2: Convert to fraction form
    916.22/1,372.74 = 763.14/x
  3. Step 3: Cross multiply
    916.22x = 1,372.74 × 763.14
  4. Step 4: Simplify right side
    916.22x = 1,047,592.80
  5. Step 5: Solve for x
    x = 1,047,592.80/916.22
  6. Step 6: Final answer
    x = 1,143.39

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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.