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Finding the Fourth Proportional to 426.19, 638.63 and 243.18

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Solution

The fourth proportional to 426.19, 638.63 and 243.18 is: 364.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.19 : 638.63 = 243.18 : x
  2. Step 2: Convert to fraction form
    426.19/638.63 = 243.18/x
  3. Step 3: Cross multiply
    426.19x = 638.63 × 243.18
  4. Step 4: Simplify right side
    426.19x = 155,301.31
  5. Step 5: Solve for x
    x = 155,301.31/426.19
  6. Step 6: Final answer
    x = 364.40

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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.