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Finding the Fourth Proportional to 397.20, 598.70 and 380.72

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Solution

The fourth proportional to 397.20, 598.70 and 380.72 is: 573.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.20 : 598.70 = 380.72 : x
  2. Step 2: Convert to fraction form
    397.20/598.70 = 380.72/x
  3. Step 3: Cross multiply
    397.20x = 598.70 × 380.72
  4. Step 4: Simplify right side
    397.20x = 227,937.06
  5. Step 5: Solve for x
    x = 227,937.06/397.20
  6. Step 6: Final answer
    x = 573.86

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.