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Finding the Fourth Proportional to 191.05, 263.65 and 103.72

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Solution

The fourth proportional to 191.05, 263.65 and 103.72 is: 143.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.05 : 263.65 = 103.72 : x
  2. Step 2: Convert to fraction form
    191.05/263.65 = 103.72/x
  3. Step 3: Cross multiply
    191.05x = 263.65 × 103.72
  4. Step 4: Simplify right side
    191.05x = 27,345.26
  5. Step 5: Solve for x
    x = 27,345.26/191.05
  6. Step 6: Final answer
    x = 143.13

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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.