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Finding the Fourth Proportional to 76.89, 106.20 and 74.64

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Solution

The fourth proportional to 76.89, 106.20 and 74.64 is: 103.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.89 : 106.20 = 74.64 : x
  2. Step 2: Convert to fraction form
    76.89/106.20 = 74.64/x
  3. Step 3: Cross multiply
    76.89x = 106.20 × 74.64
  4. Step 4: Simplify right side
    76.89x = 7,926.77
  5. Step 5: Solve for x
    x = 7,926.77/76.89
  6. Step 6: Final answer
    x = 103.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.