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Finding the Fourth Proportional to 438.36, 656.60 and 275.56

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Solution

The fourth proportional to 438.36, 656.60 and 275.56 is: 412.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.36 : 656.60 = 275.56 : x
  2. Step 2: Convert to fraction form
    438.36/656.60 = 275.56/x
  3. Step 3: Cross multiply
    438.36x = 656.60 × 275.56
  4. Step 4: Simplify right side
    438.36x = 180,932.70
  5. Step 5: Solve for x
    x = 180,932.70/438.36
  6. Step 6: Final answer
    x = 412.75

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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.