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Finding the Fourth Proportional to 105.90, 145.98 and 76.74

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Solution

The fourth proportional to 105.90, 145.98 and 76.74 is: 105.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.90 : 145.98 = 76.74 : x
  2. Step 2: Convert to fraction form
    105.90/145.98 = 76.74/x
  3. Step 3: Cross multiply
    105.90x = 145.98 × 76.74
  4. Step 4: Simplify right side
    105.90x = 11,202.51
  5. Step 5: Solve for x
    x = 11,202.51/105.90
  6. Step 6: Final answer
    x = 105.78

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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.