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Finding the Fourth Proportional to 70.02, 104.28 and 66.90

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Solution

The fourth proportional to 70.02, 104.28 and 66.90 is: 99.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.02 : 104.28 = 66.90 : x
  2. Step 2: Convert to fraction form
    70.02/104.28 = 66.90/x
  3. Step 3: Cross multiply
    70.02x = 104.28 × 66.90
  4. Step 4: Simplify right side
    70.02x = 6,976.33
  5. Step 5: Solve for x
    x = 6,976.33/70.02
  6. Step 6: Final answer
    x = 99.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.