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Finding the Fourth Proportional to 441.17, 661.72 and 258.20

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Solution

The fourth proportional to 441.17, 661.72 and 258.20 is: 387.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    441.17 : 661.72 = 258.20 : x
  2. Step 2: Convert to fraction form
    441.17/661.72 = 258.20/x
  3. Step 3: Cross multiply
    441.17x = 661.72 × 258.20
  4. Step 4: Simplify right side
    441.17x = 170,856.10
  5. Step 5: Solve for x
    x = 170,856.10/441.17
  6. Step 6: Final answer
    x = 387.28

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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.