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Finding the Fourth Proportional to 916.99, 1,372.41 and 763.22

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Solution

The fourth proportional to 916.99, 1,372.41 and 763.22 is: 1,142.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.99 : 1,372.41 = 763.22 : x
  2. Step 2: Convert to fraction form
    916.99/1,372.41 = 763.22/x
  3. Step 3: Cross multiply
    916.99x = 1,372.41 × 763.22
  4. Step 4: Simplify right side
    916.99x = 1,047,454.19
  5. Step 5: Solve for x
    x = 1,047,454.19/916.99
  6. Step 6: Final answer
    x = 1,142.28

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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.