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Finding the Fourth Proportional to 309.87, 464.79 and 93.42

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Solution

The fourth proportional to 309.87, 464.79 and 93.42 is: 140.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.87 : 464.79 = 93.42 : x
  2. Step 2: Convert to fraction form
    309.87/464.79 = 93.42/x
  3. Step 3: Cross multiply
    309.87x = 464.79 × 93.42
  4. Step 4: Simplify right side
    309.87x = 43,420.68
  5. Step 5: Solve for x
    x = 43,420.68/309.87
  6. Step 6: Final answer
    x = 140.13

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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.