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Finding the Fourth Proportional to 109.90, 151.72 and 68.46

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Solution

The fourth proportional to 109.90, 151.72 and 68.46 is: 94.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.90 : 151.72 = 68.46 : x
  2. Step 2: Convert to fraction form
    109.90/151.72 = 68.46/x
  3. Step 3: Cross multiply
    109.90x = 151.72 × 68.46
  4. Step 4: Simplify right side
    109.90x = 10,386.75
  5. Step 5: Solve for x
    x = 10,386.75/109.90
  6. Step 6: Final answer
    x = 94.51

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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.