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Finding the Fourth Proportional to 1,081.12, 1,491.84 and 615.28

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Solution

The fourth proportional to 1,081.12, 1,491.84 and 615.28 is: 849.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.12 : 1,491.84 = 615.28 : x
  2. Step 2: Convert to fraction form
    1,081.12/1,491.84 = 615.28/x
  3. Step 3: Cross multiply
    1,081.12x = 1,491.84 × 615.28
  4. Step 4: Simplify right side
    1,081.12x = 917,899.32
  5. Step 5: Solve for x
    x = 917,899.32/1,081.12
  6. Step 6: Final answer
    x = 849.03

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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.