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Finding the Fourth Proportional to 427.60, 641.47 and 153.79

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Solution

The fourth proportional to 427.60, 641.47 and 153.79 is: 230.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.60 : 641.47 = 153.79 : x
  2. Step 2: Convert to fraction form
    427.60/641.47 = 153.79/x
  3. Step 3: Cross multiply
    427.60x = 641.47 × 153.79
  4. Step 4: Simplify right side
    427.60x = 98,651.29
  5. Step 5: Solve for x
    x = 98,651.29/427.60
  6. Step 6: Final answer
    x = 230.71

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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.