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Finding the Fourth Proportional to 426.34, 638.72 and 243.18

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Solution

The fourth proportional to 426.34, 638.72 and 243.18 is: 364.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.34 : 638.72 = 243.18 : x
  2. Step 2: Convert to fraction form
    426.34/638.72 = 243.18/x
  3. Step 3: Cross multiply
    426.34x = 638.72 × 243.18
  4. Step 4: Simplify right side
    426.34x = 155,322.71
  5. Step 5: Solve for x
    x = 155,322.71/426.34
  6. Step 6: Final answer
    x = 364.32

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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.