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Finding the Fourth Proportional to 782.82, 1,081.20 and 520.38

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Solution

The fourth proportional to 782.82, 1,081.20 and 520.38 is: 718.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.82 : 1,081.20 = 520.38 : x
  2. Step 2: Convert to fraction form
    782.82/1,081.20 = 520.38/x
  3. Step 3: Cross multiply
    782.82x = 1,081.20 × 520.38
  4. Step 4: Simplify right side
    782.82x = 562,634.86
  5. Step 5: Solve for x
    x = 562,634.86/782.82
  6. Step 6: Final answer
    x = 718.73

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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.