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Finding the Fourth Proportional to 805.13, 1,112.51 and 631.79

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Solution

The fourth proportional to 805.13, 1,112.51 and 631.79 is: 872.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.13 : 1,112.51 = 631.79 : x
  2. Step 2: Convert to fraction form
    805.13/1,112.51 = 631.79/x
  3. Step 3: Cross multiply
    805.13x = 1,112.51 × 631.79
  4. Step 4: Simplify right side
    805.13x = 702,872.69
  5. Step 5: Solve for x
    x = 702,872.69/805.13
  6. Step 6: Final answer
    x = 872.99

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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.