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Finding the Fourth Proportional to 309.89, 464.72 and 104.40

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Solution

The fourth proportional to 309.89, 464.72 and 104.40 is: 156.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.89 : 464.72 = 104.40 : x
  2. Step 2: Convert to fraction form
    309.89/464.72 = 104.40/x
  3. Step 3: Cross multiply
    309.89x = 464.72 × 104.40
  4. Step 4: Simplify right side
    309.89x = 48,516.25
  5. Step 5: Solve for x
    x = 48,516.25/309.89
  6. Step 6: Final answer
    x = 156.56

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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.