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Finding the Fourth Proportional to 191.40, 263.78 and 147.72

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Solution

The fourth proportional to 191.40, 263.78 and 147.72 is: 203.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.40 : 263.78 = 147.72 : x
  2. Step 2: Convert to fraction form
    191.40/263.78 = 147.72/x
  3. Step 3: Cross multiply
    191.40x = 263.78 × 147.72
  4. Step 4: Simplify right side
    191.40x = 38,965.58
  5. Step 5: Solve for x
    x = 38,965.58/191.40
  6. Step 6: Final answer
    x = 203.58

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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.