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Finding the Fourth Proportional to 438.37, 656.95 and 221.70

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Solution

The fourth proportional to 438.37, 656.95 and 221.70 is: 332.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.37 : 656.95 = 221.70 : x
  2. Step 2: Convert to fraction form
    438.37/656.95 = 221.70/x
  3. Step 3: Cross multiply
    438.37x = 656.95 × 221.70
  4. Step 4: Simplify right side
    438.37x = 145,645.82
  5. Step 5: Solve for x
    x = 145,645.82/438.37
  6. Step 6: Final answer
    x = 332.24

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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.