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Finding the Fourth Proportional to 805.72, 1,203.40 and 682.40

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Solution

The fourth proportional to 805.72, 1,203.40 and 682.40 is: 1,019.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.72 : 1,203.40 = 682.40 : x
  2. Step 2: Convert to fraction form
    805.72/1,203.40 = 682.40/x
  3. Step 3: Cross multiply
    805.72x = 1,203.40 × 682.40
  4. Step 4: Simplify right side
    805.72x = 821,200.16
  5. Step 5: Solve for x
    x = 821,200.16/805.72
  6. Step 6: Final answer
    x = 1,019.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.