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Finding the Fourth Proportional to 70.16, 105.04 and 66.80

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Solution

The fourth proportional to 70.16, 105.04 and 66.80 is: 100.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.16 : 105.04 = 66.80 : x
  2. Step 2: Convert to fraction form
    70.16/105.04 = 66.80/x
  3. Step 3: Cross multiply
    70.16x = 105.04 × 66.80
  4. Step 4: Simplify right side
    70.16x = 7,016.67
  5. Step 5: Solve for x
    x = 7,016.67/70.16
  6. Step 6: Final answer
    x = 100.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.