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Finding the Fourth Proportional to 70.72, 106.08 and 66.08

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Solution

The fourth proportional to 70.72, 106.08 and 66.08 is: 99.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.72 : 106.08 = 66.08 : x
  2. Step 2: Convert to fraction form
    70.72/106.08 = 66.08/x
  3. Step 3: Cross multiply
    70.72x = 106.08 × 66.08
  4. Step 4: Simplify right side
    70.72x = 7,009.77
  5. Step 5: Solve for x
    x = 7,009.77/70.72
  6. Step 6: Final answer
    x = 99.12

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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.