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Finding the Fourth Proportional to 191.58, 287.18 and 130.72

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Solution

The fourth proportional to 191.58, 287.18 and 130.72 is: 195.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.58 : 287.18 = 130.72 : x
  2. Step 2: Convert to fraction form
    191.58/287.18 = 130.72/x
  3. Step 3: Cross multiply
    191.58x = 287.18 × 130.72
  4. Step 4: Simplify right side
    191.58x = 37,540.17
  5. Step 5: Solve for x
    x = 37,540.17/191.58
  6. Step 6: Final answer
    x = 195.95

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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.