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Finding the Fourth Proportional to 110.02, 151.78 and 77.21

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Solution

The fourth proportional to 110.02, 151.78 and 77.21 is: 106.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.02 : 151.78 = 77.21 : x
  2. Step 2: Convert to fraction form
    110.02/151.78 = 77.21/x
  3. Step 3: Cross multiply
    110.02x = 151.78 × 77.21
  4. Step 4: Simplify right side
    110.02x = 11,718.93
  5. Step 5: Solve for x
    x = 11,718.93/110.02
  6. Step 6: Final answer
    x = 106.52

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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.