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Finding the Fourth Proportional to 138.02, 190.50 and 88.88

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Solution

The fourth proportional to 138.02, 190.50 and 88.88 is: 122.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.02 : 190.50 = 88.88 : x
  2. Step 2: Convert to fraction form
    138.02/190.50 = 88.88/x
  3. Step 3: Cross multiply
    138.02x = 190.50 × 88.88
  4. Step 4: Simplify right side
    138.02x = 16,931.64
  5. Step 5: Solve for x
    x = 16,931.64/138.02
  6. Step 6: Final answer
    x = 122.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.