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Finding the Fourth Proportional to 309.68, 464.80 and 261.62

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Solution

The fourth proportional to 309.68, 464.80 and 261.62 is: 392.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.68 : 464.80 = 261.62 : x
  2. Step 2: Convert to fraction form
    309.68/464.80 = 261.62/x
  3. Step 3: Cross multiply
    309.68x = 464.80 × 261.62
  4. Step 4: Simplify right side
    309.68x = 121,600.98
  5. Step 5: Solve for x
    x = 121,600.98/309.68
  6. Step 6: Final answer
    x = 392.67

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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.