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Finding the Fourth Proportional to 438.01, 657.32 and 221.54

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Solution

The fourth proportional to 438.01, 657.32 and 221.54 is: 332.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.01 : 657.32 = 221.54 : x
  2. Step 2: Convert to fraction form
    438.01/657.32 = 221.54/x
  3. Step 3: Cross multiply
    438.01x = 657.32 × 221.54
  4. Step 4: Simplify right side
    438.01x = 145,618.28
  5. Step 5: Solve for x
    x = 145,618.28/438.01
  6. Step 6: Final answer
    x = 332.46

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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.