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Finding the Fourth Proportional to 131.88, 197.42 and 90.84

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Solution

The fourth proportional to 131.88, 197.42 and 90.84 is: 135.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.88 : 197.42 = 90.84 : x
  2. Step 2: Convert to fraction form
    131.88/197.42 = 90.84/x
  3. Step 3: Cross multiply
    131.88x = 197.42 × 90.84
  4. Step 4: Simplify right side
    131.88x = 17,933.63
  5. Step 5: Solve for x
    x = 17,933.63/131.88
  6. Step 6: Final answer
    x = 135.98

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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.