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Finding the Fourth Proportional to 109.90, 151.65 and 68.47

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Solution

The fourth proportional to 109.90, 151.65 and 68.47 is: 94.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.90 : 151.65 = 68.47 : x
  2. Step 2: Convert to fraction form
    109.90/151.65 = 68.47/x
  3. Step 3: Cross multiply
    109.90x = 151.65 × 68.47
  4. Step 4: Simplify right side
    109.90x = 10,383.48
  5. Step 5: Solve for x
    x = 10,383.48/109.90
  6. Step 6: Final answer
    x = 94.48

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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.