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Finding the Fourth Proportional to 146.64, 219.80 and 85.90

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Solution

The fourth proportional to 146.64, 219.80 and 85.90 is: 128.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.64 : 219.80 = 85.90 : x
  2. Step 2: Convert to fraction form
    146.64/219.80 = 85.90/x
  3. Step 3: Cross multiply
    146.64x = 219.80 × 85.90
  4. Step 4: Simplify right side
    146.64x = 18,880.82
  5. Step 5: Solve for x
    x = 18,880.82/146.64
  6. Step 6: Final answer
    x = 128.76

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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.