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Finding the Fourth Proportional to 392.22, 587.76 and 209.55

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Solution

The fourth proportional to 392.22, 587.76 and 209.55 is: 314.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.22 : 587.76 = 209.55 : x
  2. Step 2: Convert to fraction form
    392.22/587.76 = 209.55/x
  3. Step 3: Cross multiply
    392.22x = 587.76 × 209.55
  4. Step 4: Simplify right side
    392.22x = 123,165.11
  5. Step 5: Solve for x
    x = 123,165.11/392.22
  6. Step 6: Final answer
    x = 314.02

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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.