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Finding the Fourth Proportional to 426.16, 639.30 and 137.59

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Solution

The fourth proportional to 426.16, 639.30 and 137.59 is: 206.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.16 : 639.30 = 137.59 : x
  2. Step 2: Convert to fraction form
    426.16/639.30 = 137.59/x
  3. Step 3: Cross multiply
    426.16x = 639.30 × 137.59
  4. Step 4: Simplify right side
    426.16x = 87,961.29
  5. Step 5: Solve for x
    x = 87,961.29/426.16
  6. Step 6: Final answer
    x = 206.40

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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.