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Finding the Fourth Proportional to 438.04, 656.70 and 221.56

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Solution

The fourth proportional to 438.04, 656.70 and 221.56 is: 332.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.04 : 656.70 = 221.56 : x
  2. Step 2: Convert to fraction form
    438.04/656.70 = 221.56/x
  3. Step 3: Cross multiply
    438.04x = 656.70 × 221.56
  4. Step 4: Simplify right side
    438.04x = 145,498.45
  5. Step 5: Solve for x
    x = 145,498.45/438.04
  6. Step 6: Final answer
    x = 332.16

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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.