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Finding the Fourth Proportional to 191.50, 264.33 and 139.90

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Solution

The fourth proportional to 191.50, 264.33 and 139.90 is: 193.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.50 : 264.33 = 139.90 : x
  2. Step 2: Convert to fraction form
    191.50/264.33 = 139.90/x
  3. Step 3: Cross multiply
    191.50x = 264.33 × 139.90
  4. Step 4: Simplify right side
    191.50x = 36,979.77
  5. Step 5: Solve for x
    x = 36,979.77/191.50
  6. Step 6: Final answer
    x = 193.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.