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Finding the Fourth Proportional to 312.99, 469.68 and 159.09

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Solution

The fourth proportional to 312.99, 469.68 and 159.09 is: 238.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.99 : 469.68 = 159.09 : x
  2. Step 2: Convert to fraction form
    312.99/469.68 = 159.09/x
  3. Step 3: Cross multiply
    312.99x = 469.68 × 159.09
  4. Step 4: Simplify right side
    312.99x = 74,721.39
  5. Step 5: Solve for x
    x = 74,721.39/312.99
  6. Step 6: Final answer
    x = 238.73

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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.