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Finding the Fourth Proportional to 426.19, 638.67 and 243.13

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Solution

The fourth proportional to 426.19, 638.67 and 243.13 is: 364.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.19 : 638.67 = 243.13 : x
  2. Step 2: Convert to fraction form
    426.19/638.67 = 243.13/x
  3. Step 3: Cross multiply
    426.19x = 638.67 × 243.13
  4. Step 4: Simplify right side
    426.19x = 155,276.64
  5. Step 5: Solve for x
    x = 155,276.64/426.19
  6. Step 6: Final answer
    x = 364.34

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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.