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Finding the Fourth Proportional to 130.95, 196.47 and 85.41

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Solution

The fourth proportional to 130.95, 196.47 and 85.41 is: 128.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.95 : 196.47 = 85.41 : x
  2. Step 2: Convert to fraction form
    130.95/196.47 = 85.41/x
  3. Step 3: Cross multiply
    130.95x = 196.47 × 85.41
  4. Step 4: Simplify right side
    130.95x = 16,780.50
  5. Step 5: Solve for x
    x = 16,780.50/130.95
  6. Step 6: Final answer
    x = 128.14

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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.