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Finding the Fourth Proportional to 75.12, 112.80 and 48

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Solution

The fourth proportional to 75.12, 112.80 and 48 is: 72.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.12 : 112.80 = 48 : x
  2. Step 2: Convert to fraction form
    75.12/112.80 = 48/x
  3. Step 3: Cross multiply
    75.12x = 112.80 × 48
  4. Step 4: Simplify right side
    75.12x = 5,414.40
  5. Step 5: Solve for x
    x = 5,414.40/75.12
  6. Step 6: Final answer
    x = 72.08

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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.