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Finding the Fourth Proportional to 438.07, 656.23 and 264.78

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Solution

The fourth proportional to 438.07, 656.23 and 264.78 is: 396.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.07 : 656.23 = 264.78 : x
  2. Step 2: Convert to fraction form
    438.07/656.23 = 264.78/x
  3. Step 3: Cross multiply
    438.07x = 656.23 × 264.78
  4. Step 4: Simplify right side
    438.07x = 173,756.58
  5. Step 5: Solve for x
    x = 173,756.58/438.07
  6. Step 6: Final answer
    x = 396.64

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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.