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Finding the Fourth Proportional to 103.30, 155.70 and 99.18

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Solution

The fourth proportional to 103.30, 155.70 and 99.18 is: 149.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.30 : 155.70 = 99.18 : x
  2. Step 2: Convert to fraction form
    103.30/155.70 = 99.18/x
  3. Step 3: Cross multiply
    103.30x = 155.70 × 99.18
  4. Step 4: Simplify right side
    103.30x = 15,442.33
  5. Step 5: Solve for x
    x = 15,442.33/103.30
  6. Step 6: Final answer
    x = 149.49

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.