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Finding the Fourth Proportional to 805.13, 1,207.69 and 372.59

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Solution

The fourth proportional to 805.13, 1,207.69 and 372.59 is: 558.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.13 : 1,207.69 = 372.59 : x
  2. Step 2: Convert to fraction form
    805.13/1,207.69 = 372.59/x
  3. Step 3: Cross multiply
    805.13x = 1,207.69 × 372.59
  4. Step 4: Simplify right side
    805.13x = 449,973.22
  5. Step 5: Solve for x
    x = 449,973.22/805.13
  6. Step 6: Final answer
    x = 558.88

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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.