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Finding the Fourth Proportional to 105.35, 157.32 and 91.67

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Solution

The fourth proportional to 105.35, 157.32 and 91.67 is: 136.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.35 : 157.32 = 91.67 : x
  2. Step 2: Convert to fraction form
    105.35/157.32 = 91.67/x
  3. Step 3: Cross multiply
    105.35x = 157.32 × 91.67
  4. Step 4: Simplify right side
    105.35x = 14,420.74
  5. Step 5: Solve for x
    x = 14,420.74/105.35
  6. Step 6: Final answer
    x = 136.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.