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Finding the Fourth Proportional to 109.96, 151.73 and 65.70

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Solution

The fourth proportional to 109.96, 151.73 and 65.70 is: 90.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.96 : 151.73 = 65.70 : x
  2. Step 2: Convert to fraction form
    109.96/151.73 = 65.70/x
  3. Step 3: Cross multiply
    109.96x = 151.73 × 65.70
  4. Step 4: Simplify right side
    109.96x = 9,968.33
  5. Step 5: Solve for x
    x = 9,968.33/109.96
  6. Step 6: Final answer
    x = 90.66

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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.