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Finding the Fourth Proportional to 782.51, 1,079.64 and 487.62

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Solution

The fourth proportional to 782.51, 1,079.64 and 487.62 is: 672.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.51 : 1,079.64 = 487.62 : x
  2. Step 2: Convert to fraction form
    782.51/1,079.64 = 487.62/x
  3. Step 3: Cross multiply
    782.51x = 1,079.64 × 487.62
  4. Step 4: Simplify right side
    782.51x = 526,454.06
  5. Step 5: Solve for x
    x = 526,454.06/782.51
  6. Step 6: Final answer
    x = 672.78

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Double scale
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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.