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Finding the Fourth Proportional to 910.11, 1,256.34 and 615.78

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Solution

The fourth proportional to 910.11, 1,256.34 and 615.78 is: 850.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.11 : 1,256.34 = 615.78 : x
  2. Step 2: Convert to fraction form
    910.11/1,256.34 = 615.78/x
  3. Step 3: Cross multiply
    910.11x = 1,256.34 × 615.78
  4. Step 4: Simplify right side
    910.11x = 773,629.05
  5. Step 5: Solve for x
    x = 773,629.05/910.11
  6. Step 6: Final answer
    x = 850.04

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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.