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Finding the Fourth Proportional to 392.30, 545.01 and 388.73

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Solution

The fourth proportional to 392.30, 545.01 and 388.73 is: 540.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.30 : 545.01 = 388.73 : x
  2. Step 2: Convert to fraction form
    392.30/545.01 = 388.73/x
  3. Step 3: Cross multiply
    392.30x = 545.01 × 388.73
  4. Step 4: Simplify right side
    392.30x = 211,863.10
  5. Step 5: Solve for x
    x = 211,863.10/392.30
  6. Step 6: Final answer
    x = 540.05

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.