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Finding the Fourth Proportional to 105.48, 145.58 and 91.71

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Solution

The fourth proportional to 105.48, 145.58 and 91.71 is: 126.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.48 : 145.58 = 91.71 : x
  2. Step 2: Convert to fraction form
    105.48/145.58 = 91.71/x
  3. Step 3: Cross multiply
    105.48x = 145.58 × 91.71
  4. Step 4: Simplify right side
    105.48x = 13,351.14
  5. Step 5: Solve for x
    x = 13,351.14/105.48
  6. Step 6: Final answer
    x = 126.58

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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.