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Finding the Fourth Proportional to 102.93, 141.93 and 91.86

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Solution

The fourth proportional to 102.93, 141.93 and 91.86 is: 126.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.93 : 141.93 = 91.86 : x
  2. Step 2: Convert to fraction form
    102.93/141.93 = 91.86/x
  3. Step 3: Cross multiply
    102.93x = 141.93 × 91.86
  4. Step 4: Simplify right side
    102.93x = 13,037.69
  5. Step 5: Solve for x
    x = 13,037.69/102.93
  6. Step 6: Final answer
    x = 126.67

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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.