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Finding the Fourth Proportional to 191.57, 287.15 and 137.70

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Solution

The fourth proportional to 191.57, 287.15 and 137.70 is: 206.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.57 : 287.15 = 137.70 : x
  2. Step 2: Convert to fraction form
    191.57/287.15 = 137.70/x
  3. Step 3: Cross multiply
    191.57x = 287.15 × 137.70
  4. Step 4: Simplify right side
    191.57x = 39,539.87
  5. Step 5: Solve for x
    x = 39,539.87/191.57
  6. Step 6: Final answer
    x = 206.40

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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.