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Finding the Fourth Proportional to 75.36, 112.80 and 66.36

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Solution

The fourth proportional to 75.36, 112.80 and 66.36 is: 99.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.36 : 112.80 = 66.36 : x
  2. Step 2: Convert to fraction form
    75.36/112.80 = 66.36/x
  3. Step 3: Cross multiply
    75.36x = 112.80 × 66.36
  4. Step 4: Simplify right side
    75.36x = 7,485.41
  5. Step 5: Solve for x
    x = 7,485.41/75.36
  6. Step 6: Final answer
    x = 99.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.