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Finding the Fourth Proportional to 309.92, 464.13 and 258.89

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Solution

The fourth proportional to 309.92, 464.13 and 258.89 is: 387.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.92 : 464.13 = 258.89 : x
  2. Step 2: Convert to fraction form
    309.92/464.13 = 258.89/x
  3. Step 3: Cross multiply
    309.92x = 464.13 × 258.89
  4. Step 4: Simplify right side
    309.92x = 120,156.30
  5. Step 5: Solve for x
    x = 120,156.30/309.92
  6. Step 6: Final answer
    x = 387.71

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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.