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Finding the Fourth Proportional to 912.63, 1,257.92 and 646.74

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Solution

The fourth proportional to 912.63, 1,257.92 and 646.74 is: 891.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.63 : 1,257.92 = 646.74 : x
  2. Step 2: Convert to fraction form
    912.63/1,257.92 = 646.74/x
  3. Step 3: Cross multiply
    912.63x = 1,257.92 × 646.74
  4. Step 4: Simplify right side
    912.63x = 813,543.95
  5. Step 5: Solve for x
    x = 813,543.95/912.63
  6. Step 6: Final answer
    x = 891.43

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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.