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Finding the Fourth Proportional to 75.15, 104.40 and 74.40

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Solution

The fourth proportional to 75.15, 104.40 and 74.40 is: 103.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.15 : 104.40 = 74.40 : x
  2. Step 2: Convert to fraction form
    75.15/104.40 = 74.40/x
  3. Step 3: Cross multiply
    75.15x = 104.40 × 74.40
  4. Step 4: Simplify right side
    75.15x = 7,767.36
  5. Step 5: Solve for x
    x = 7,767.36/75.15
  6. Step 6: Final answer
    x = 103.36

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.