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Finding the Fourth Proportional to 146.15, 201.60 and 90.87

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Solution

The fourth proportional to 146.15, 201.60 and 90.87 is: 125.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.15 : 201.60 = 90.87 : x
  2. Step 2: Convert to fraction form
    146.15/201.60 = 90.87/x
  3. Step 3: Cross multiply
    146.15x = 201.60 × 90.87
  4. Step 4: Simplify right side
    146.15x = 18,319.39
  5. Step 5: Solve for x
    x = 18,319.39/146.15
  6. Step 6: Final answer
    x = 125.35

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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.