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Finding the Fourth Proportional to 309.48, 464.34 and 187.72

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Solution

The fourth proportional to 309.48, 464.34 and 187.72 is: 281.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.48 : 464.34 = 187.72 : x
  2. Step 2: Convert to fraction form
    309.48/464.34 = 187.72/x
  3. Step 3: Cross multiply
    309.48x = 464.34 × 187.72
  4. Step 4: Simplify right side
    309.48x = 87,165.90
  5. Step 5: Solve for x
    x = 87,165.90/309.48
  6. Step 6: Final answer
    x = 281.65

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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.