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Finding the Fourth Proportional to 916.33, 1,371.76 and 642.27

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Solution

The fourth proportional to 916.33, 1,371.76 and 642.27 is: 961.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.33 : 1,371.76 = 642.27 : x
  2. Step 2: Convert to fraction form
    916.33/1,371.76 = 642.27/x
  3. Step 3: Cross multiply
    916.33x = 1,371.76 × 642.27
  4. Step 4: Simplify right side
    916.33x = 881,035.21
  5. Step 5: Solve for x
    x = 881,035.21/916.33
  6. Step 6: Final answer
    x = 961.49

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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.