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Finding the Fourth Proportional to 636.36, 879.20 and 587.15

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Solution

The fourth proportional to 636.36, 879.20 and 587.15 is: 811.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.36 : 879.20 = 587.15 : x
  2. Step 2: Convert to fraction form
    636.36/879.20 = 587.15/x
  3. Step 3: Cross multiply
    636.36x = 879.20 × 587.15
  4. Step 4: Simplify right side
    636.36x = 516,223.75
  5. Step 5: Solve for x
    x = 516,223.75/636.36
  6. Step 6: Final answer
    x = 811.22

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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.