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Finding the Fourth Proportional to 105.99, 146.26 and 61.74

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Solution

The fourth proportional to 105.99, 146.26 and 61.74 is: 85.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.99 : 146.26 = 61.74 : x
  2. Step 2: Convert to fraction form
    105.99/146.26 = 61.74/x
  3. Step 3: Cross multiply
    105.99x = 146.26 × 61.74
  4. Step 4: Simplify right side
    105.99x = 9,030.09
  5. Step 5: Solve for x
    x = 9,030.09/105.99
  6. Step 6: Final answer
    x = 85.20

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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.