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Finding the Fourth Proportional to 418.72, 628.32 and 158.68

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Solution

The fourth proportional to 418.72, 628.32 and 158.68 is: 238.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.72 : 628.32 = 158.68 : x
  2. Step 2: Convert to fraction form
    418.72/628.32 = 158.68/x
  3. Step 3: Cross multiply
    418.72x = 628.32 × 158.68
  4. Step 4: Simplify right side
    418.72x = 99,701.82
  5. Step 5: Solve for x
    x = 99,701.82/418.72
  6. Step 6: Final answer
    x = 238.11

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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.