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Finding the Fourth Proportional to 916.54, 1,264.40 and 667.76

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Solution

The fourth proportional to 916.54, 1,264.40 and 667.76 is: 921.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.54 : 1,264.40 = 667.76 : x
  2. Step 2: Convert to fraction form
    916.54/1,264.40 = 667.76/x
  3. Step 3: Cross multiply
    916.54x = 1,264.40 × 667.76
  4. Step 4: Simplify right side
    916.54x = 844,315.74
  5. Step 5: Solve for x
    x = 844,315.74/916.54
  6. Step 6: Final answer
    x = 921.20

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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.