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Finding the Fourth Proportional to 130.87, 196.58 and 85.29

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Solution

The fourth proportional to 130.87, 196.58 and 85.29 is: 128.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.87 : 196.58 = 85.29 : x
  2. Step 2: Convert to fraction form
    130.87/196.58 = 85.29/x
  3. Step 3: Cross multiply
    130.87x = 196.58 × 85.29
  4. Step 4: Simplify right side
    130.87x = 16,766.31
  5. Step 5: Solve for x
    x = 16,766.31/130.87
  6. Step 6: Final answer
    x = 128.11

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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.