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Finding the Fourth Proportional to 72.72, 109.08 and 70.74

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Solution

The fourth proportional to 72.72, 109.08 and 70.74 is: 106.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.72 : 109.08 = 70.74 : x
  2. Step 2: Convert to fraction form
    72.72/109.08 = 70.74/x
  3. Step 3: Cross multiply
    72.72x = 109.08 × 70.74
  4. Step 4: Simplify right side
    72.72x = 7,716.32
  5. Step 5: Solve for x
    x = 7,716.32/72.72
  6. Step 6: Final answer
    x = 106.11

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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.