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Finding the Fourth Proportional to 74.30, 110.78 and 71.48

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Solution

The fourth proportional to 74.30, 110.78 and 71.48 is: 106.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.30 : 110.78 = 71.48 : x
  2. Step 2: Convert to fraction form
    74.30/110.78 = 71.48/x
  3. Step 3: Cross multiply
    74.30x = 110.78 × 71.48
  4. Step 4: Simplify right side
    74.30x = 7,918.55
  5. Step 5: Solve for x
    x = 7,918.55/74.30
  6. Step 6: Final answer
    x = 106.58

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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.