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Finding the Fourth Proportional to 1,080.06, 1,489.41 and 687.30

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Solution

The fourth proportional to 1,080.06, 1,489.41 and 687.30 is: 947.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.06 : 1,489.41 = 687.30 : x
  2. Step 2: Convert to fraction form
    1,080.06/1,489.41 = 687.30/x
  3. Step 3: Cross multiply
    1,080.06x = 1,489.41 × 687.30
  4. Step 4: Simplify right side
    1,080.06x = 1,023,671.49
  5. Step 5: Solve for x
    x = 1,023,671.49/1,080.06
  6. Step 6: Final answer
    x = 947.79

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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.