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Finding the Fourth Proportional to 916.43, 1,371.45 and 749.98

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Solution

The fourth proportional to 916.43, 1,371.45 and 749.98 is: 1,122.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.43 : 1,371.45 = 749.98 : x
  2. Step 2: Convert to fraction form
    916.43/1,371.45 = 749.98/x
  3. Step 3: Cross multiply
    916.43x = 1,371.45 × 749.98
  4. Step 4: Simplify right side
    916.43x = 1,028,553.21
  5. Step 5: Solve for x
    x = 1,028,553.21/916.43
  6. Step 6: Final answer
    x = 1,122.35

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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.