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Finding the Fourth Proportional to 426.56, 639.95 and 138

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Solution

The fourth proportional to 426.56, 639.95 and 138 is: 207.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.56 : 639.95 = 138 : x
  2. Step 2: Convert to fraction form
    426.56/639.95 = 138/x
  3. Step 3: Cross multiply
    426.56x = 639.95 × 138
  4. Step 4: Simplify right side
    426.56x = 88,312.41
  5. Step 5: Solve for x
    x = 88,312.41/426.56
  6. Step 6: Final answer
    x = 207.03

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.