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Finding the Fourth Proportional to 782.22, 1,079.68 and 487.32

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Solution

The fourth proportional to 782.22, 1,079.68 and 487.32 is: 672.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.22 : 1,079.68 = 487.32 : x
  2. Step 2: Convert to fraction form
    782.22/1,079.68 = 487.32/x
  3. Step 3: Cross multiply
    782.22x = 1,079.68 × 487.32
  4. Step 4: Simplify right side
    782.22x = 526,149.66
  5. Step 5: Solve for x
    x = 526,149.66/782.22
  6. Step 6: Final answer
    x = 672.64

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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.