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Finding the Fourth Proportional to 103.40, 155.30 and 99.75

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Solution

The fourth proportional to 103.40, 155.30 and 99.75 is: 149.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.40 : 155.30 = 99.75 : x
  2. Step 2: Convert to fraction form
    103.40/155.30 = 99.75/x
  3. Step 3: Cross multiply
    103.40x = 155.30 × 99.75
  4. Step 4: Simplify right side
    103.40x = 15,490.68
  5. Step 5: Solve for x
    x = 15,490.68/103.40
  6. Step 6: Final answer
    x = 149.82

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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.