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Finding the Fourth Proportional to 198.36, 297.45 and 90.15

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Solution

The fourth proportional to 198.36, 297.45 and 90.15 is: 135.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.36 : 297.45 = 90.15 : x
  2. Step 2: Convert to fraction form
    198.36/297.45 = 90.15/x
  3. Step 3: Cross multiply
    198.36x = 297.45 × 90.15
  4. Step 4: Simplify right side
    198.36x = 26,814.00
  5. Step 5: Solve for x
    x = 26,814.00/198.36
  6. Step 6: Final answer
    x = 135.18

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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.