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Finding the Fourth Proportional to 97.32, 133.47 and 90.12

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Solution

The fourth proportional to 97.32, 133.47 and 90.12 is: 123.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.32 : 133.47 = 90.12 : x
  2. Step 2: Convert to fraction form
    97.32/133.47 = 90.12/x
  3. Step 3: Cross multiply
    97.32x = 133.47 × 90.12
  4. Step 4: Simplify right side
    97.32x = 12,028.32
  5. Step 5: Solve for x
    x = 12,028.32/97.32
  6. Step 6: Final answer
    x = 123.60

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.