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Finding the Fourth Proportional to 681.58, 1,020.84 and 315.82

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Solution

The fourth proportional to 681.58, 1,020.84 and 315.82 is: 473.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.58 : 1,020.84 = 315.82 : x
  2. Step 2: Convert to fraction form
    681.58/1,020.84 = 315.82/x
  3. Step 3: Cross multiply
    681.58x = 1,020.84 × 315.82
  4. Step 4: Simplify right side
    681.58x = 322,401.69
  5. Step 5: Solve for x
    x = 322,401.69/681.58
  6. Step 6: Final answer
    x = 473.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.