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Finding the Fourth Proportional to 309.68, 464.29 and 187.91

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Solution

The fourth proportional to 309.68, 464.29 and 187.91 is: 281.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.68 : 464.29 = 187.91 : x
  2. Step 2: Convert to fraction form
    309.68/464.29 = 187.91/x
  3. Step 3: Cross multiply
    309.68x = 464.29 × 187.91
  4. Step 4: Simplify right side
    309.68x = 87,243.79
  5. Step 5: Solve for x
    x = 87,243.79/309.68
  6. Step 6: Final answer
    x = 281.72

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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.