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Finding the Fourth Proportional to 106.15, 146.31 and 76.99

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Solution

The fourth proportional to 106.15, 146.31 and 76.99 is: 106.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.15 : 146.31 = 76.99 : x
  2. Step 2: Convert to fraction form
    106.15/146.31 = 76.99/x
  3. Step 3: Cross multiply
    106.15x = 146.31 × 76.99
  4. Step 4: Simplify right side
    106.15x = 11,264.41
  5. Step 5: Solve for x
    x = 11,264.41/106.15
  6. Step 6: Final answer
    x = 106.12

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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.