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Finding the Fourth Proportional to 425.37, 638.40 and 220.00

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Solution

The fourth proportional to 425.37, 638.40 and 220.00 is: 330.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.37 : 638.40 = 220.00 : x
  2. Step 2: Convert to fraction form
    425.37/638.40 = 220.00/x
  3. Step 3: Cross multiply
    425.37x = 638.40 × 220.00
  4. Step 4: Simplify right side
    425.37x = 140,446.31
  5. Step 5: Solve for x
    x = 140,446.31/425.37
  6. Step 6: Final answer
    x = 330.17

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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.