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Finding the Fourth Proportional to 664.74, 916.88 and 454.55

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Solution

The fourth proportional to 664.74, 916.88 and 454.55 is: 626.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.74 : 916.88 = 454.55 : x
  2. Step 2: Convert to fraction form
    664.74/916.88 = 454.55/x
  3. Step 3: Cross multiply
    664.74x = 916.88 × 454.55
  4. Step 4: Simplify right side
    664.74x = 416,760.95
  5. Step 5: Solve for x
    x = 416,760.95/664.74
  6. Step 6: Final answer
    x = 626.95

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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.