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Finding the Fourth Proportional to 97.87, 146.84 and 90.31

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Solution

The fourth proportional to 97.87, 146.84 and 90.31 is: 135.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.87 : 146.84 = 90.31 : x
  2. Step 2: Convert to fraction form
    97.87/146.84 = 90.31/x
  3. Step 3: Cross multiply
    97.87x = 146.84 × 90.31
  4. Step 4: Simplify right side
    97.87x = 13,261.12
  5. Step 5: Solve for x
    x = 13,261.12/97.87
  6. Step 6: Final answer
    x = 135.50

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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.