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Finding the Fourth Proportional to 194.47, 291.56 and 91.70

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Solution

The fourth proportional to 194.47, 291.56 and 91.70 is: 137.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.47 : 291.56 = 91.70 : x
  2. Step 2: Convert to fraction form
    194.47/291.56 = 91.70/x
  3. Step 3: Cross multiply
    194.47x = 291.56 × 91.70
  4. Step 4: Simplify right side
    194.47x = 26,735.82
  5. Step 5: Solve for x
    x = 26,735.82/194.47
  6. Step 6: Final answer
    x = 137.48

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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.