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Finding the Fourth Proportional to 105.86, 146.07 and 90.24

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Solution

The fourth proportional to 105.86, 146.07 and 90.24 is: 124.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.86 : 146.07 = 90.24 : x
  2. Step 2: Convert to fraction form
    105.86/146.07 = 90.24/x
  3. Step 3: Cross multiply
    105.86x = 146.07 × 90.24
  4. Step 4: Simplify right side
    105.86x = 13,181.36
  5. Step 5: Solve for x
    x = 13,181.36/105.86
  6. Step 6: Final answer
    x = 124.52

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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.