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Finding the Fourth Proportional to 438.10, 656.47 and 275.44

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Solution

The fourth proportional to 438.10, 656.47 and 275.44 is: 412.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.10 : 656.47 = 275.44 : x
  2. Step 2: Convert to fraction form
    438.10/656.47 = 275.44/x
  3. Step 3: Cross multiply
    438.10x = 656.47 × 275.44
  4. Step 4: Simplify right side
    438.10x = 180,818.72
  5. Step 5: Solve for x
    x = 180,818.72/438.10
  6. Step 6: Final answer
    x = 412.73

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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.