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Finding the Fourth Proportional to 916.41, 1,264.82 and 667.41

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Solution

The fourth proportional to 916.41, 1,264.82 and 667.41 is: 921.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.41 : 1,264.82 = 667.41 : x
  2. Step 2: Convert to fraction form
    916.41/1,264.82 = 667.41/x
  3. Step 3: Cross multiply
    916.41x = 1,264.82 × 667.41
  4. Step 4: Simplify right side
    916.41x = 844,156.11
  5. Step 5: Solve for x
    x = 844,156.11/916.41
  6. Step 6: Final answer
    x = 921.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.