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Finding the Fourth Proportional to 782.01, 1,080 and 487.44

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Solution

The fourth proportional to 782.01, 1,080 and 487.44 is: 673.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.01 : 1,080 = 487.44 : x
  2. Step 2: Convert to fraction form
    782.01/1,080 = 487.44/x
  3. Step 3: Cross multiply
    782.01x = 1,080 × 487.44
  4. Step 4: Simplify right side
    782.01x = 526,435.20
  5. Step 5: Solve for x
    x = 526,435.20/782.01
  6. Step 6: Final answer
    x = 673.18

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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.