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Finding the Fourth Proportional to 191.57, 264.12 and 139.19

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Solution

The fourth proportional to 191.57, 264.12 and 139.19 is: 191.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.57 : 264.12 = 139.19 : x
  2. Step 2: Convert to fraction form
    191.57/264.12 = 139.19/x
  3. Step 3: Cross multiply
    191.57x = 264.12 × 139.19
  4. Step 4: Simplify right side
    191.57x = 36,762.86
  5. Step 5: Solve for x
    x = 36,762.86/191.57
  6. Step 6: Final answer
    x = 191.90

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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.