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Finding the Fourth Proportional to 104.78, 157.35 and 91.37

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Solution

The fourth proportional to 104.78, 157.35 and 91.37 is: 137.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.78 : 157.35 = 91.37 : x
  2. Step 2: Convert to fraction form
    104.78/157.35 = 91.37/x
  3. Step 3: Cross multiply
    104.78x = 157.35 × 91.37
  4. Step 4: Simplify right side
    104.78x = 14,377.81
  5. Step 5: Solve for x
    x = 14,377.81/104.78
  6. Step 6: Final answer
    x = 137.22

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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.