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Finding the Fourth Proportional to 438.15, 656.89 and 264.78

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Solution

The fourth proportional to 438.15, 656.89 and 264.78 is: 396.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.15 : 656.89 = 264.78 : x
  2. Step 2: Convert to fraction form
    438.15/656.89 = 264.78/x
  3. Step 3: Cross multiply
    438.15x = 656.89 × 264.78
  4. Step 4: Simplify right side
    438.15x = 173,928.05
  5. Step 5: Solve for x
    x = 173,928.05/438.15
  6. Step 6: Final answer
    x = 396.96

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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.