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Finding the Fourth Proportional to 392.08, 587.30 and 380.74

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Solution

The fourth proportional to 392.08, 587.30 and 380.74 is: 570.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.08 : 587.30 = 380.74 : x
  2. Step 2: Convert to fraction form
    392.08/587.30 = 380.74/x
  3. Step 3: Cross multiply
    392.08x = 587.30 × 380.74
  4. Step 4: Simplify right side
    392.08x = 223,608.60
  5. Step 5: Solve for x
    x = 223,608.60/392.08
  6. Step 6: Final answer
    x = 570.31

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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.