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Finding the Fourth Proportional to 881.20, 1,215.60 and 615.52

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Solution

The fourth proportional to 881.20, 1,215.60 and 615.52 is: 849.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.20 : 1,215.60 = 615.52 : x
  2. Step 2: Convert to fraction form
    881.20/1,215.60 = 615.52/x
  3. Step 3: Cross multiply
    881.20x = 1,215.60 × 615.52
  4. Step 4: Simplify right side
    881.20x = 748,226.11
  5. Step 5: Solve for x
    x = 748,226.11/881.20
  6. Step 6: Final answer
    x = 849.10

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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.