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Finding the Fourth Proportional to 75.36, 103.40 and 72.48

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Solution

The fourth proportional to 75.36, 103.40 and 72.48 is: 99.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.36 : 103.40 = 72.48 : x
  2. Step 2: Convert to fraction form
    75.36/103.40 = 72.48/x
  3. Step 3: Cross multiply
    75.36x = 103.40 × 72.48
  4. Step 4: Simplify right side
    75.36x = 7,494.43
  5. Step 5: Solve for x
    x = 7,494.43/75.36
  6. Step 6: Final answer
    x = 99.45

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.