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Finding the Fourth Proportional to 928.41, 1,278.88 and 648.15

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Solution

The fourth proportional to 928.41, 1,278.88 and 648.15 is: 892.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.41 : 1,278.88 = 648.15 : x
  2. Step 2: Convert to fraction form
    928.41/1,278.88 = 648.15/x
  3. Step 3: Cross multiply
    928.41x = 1,278.88 × 648.15
  4. Step 4: Simplify right side
    928.41x = 828,906.07
  5. Step 5: Solve for x
    x = 828,906.07/928.41
  6. Step 6: Final answer
    x = 892.82

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1.5x scale

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.