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Finding the Fourth Proportional to 79.60, 119.40 and 73.72

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Solution

The fourth proportional to 79.60, 119.40 and 73.72 is: 110.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.60 : 119.40 = 73.72 : x
  2. Step 2: Convert to fraction form
    79.60/119.40 = 73.72/x
  3. Step 3: Cross multiply
    79.60x = 119.40 × 73.72
  4. Step 4: Simplify right side
    79.60x = 8,802.17
  5. Step 5: Solve for x
    x = 8,802.17/79.60
  6. Step 6: Final answer
    x = 110.58

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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.