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Finding the Fourth Proportional to 79.47, 118.40 and 74.81

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Solution

The fourth proportional to 79.47, 118.40 and 74.81 is: 111.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.47 : 118.40 = 74.81 : x
  2. Step 2: Convert to fraction form
    79.47/118.40 = 74.81/x
  3. Step 3: Cross multiply
    79.47x = 118.40 × 74.81
  4. Step 4: Simplify right side
    79.47x = 8,857.43
  5. Step 5: Solve for x
    x = 8,857.43/79.47
  6. Step 6: Final answer
    x = 111.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.