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Finding the Fourth Proportional to 392.46, 587.47 and 209.40

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Solution

The fourth proportional to 392.46, 587.47 and 209.40 is: 313.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.46 : 587.47 = 209.40 : x
  2. Step 2: Convert to fraction form
    392.46/587.47 = 209.40/x
  3. Step 3: Cross multiply
    392.46x = 587.47 × 209.40
  4. Step 4: Simplify right side
    392.46x = 123,016.22
  5. Step 5: Solve for x
    x = 123,016.22/392.46
  6. Step 6: Final answer
    x = 313.45

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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.