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Finding the Fourth Proportional to 191.54, 287.72 and 140.51

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Solution

The fourth proportional to 191.54, 287.72 and 140.51 is: 211.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.54 : 287.72 = 140.51 : x
  2. Step 2: Convert to fraction form
    191.54/287.72 = 140.51/x
  3. Step 3: Cross multiply
    191.54x = 287.72 × 140.51
  4. Step 4: Simplify right side
    191.54x = 40,427.54
  5. Step 5: Solve for x
    x = 40,427.54/191.54
  6. Step 6: Final answer
    x = 211.07

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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.