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Finding the Fourth Proportional to 146.87, 202.61 and 87.80

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Solution

The fourth proportional to 146.87, 202.61 and 87.80 is: 121.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.87 : 202.61 = 87.80 : x
  2. Step 2: Convert to fraction form
    146.87/202.61 = 87.80/x
  3. Step 3: Cross multiply
    146.87x = 202.61 × 87.80
  4. Step 4: Simplify right side
    146.87x = 17,788.36
  5. Step 5: Solve for x
    x = 17,788.36/146.87
  6. Step 6: Final answer
    x = 121.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.