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Finding the Fourth Proportional to 74.88, 112.80 and 56.96

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Solution

The fourth proportional to 74.88, 112.80 and 56.96 is: 85.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.88 : 112.80 = 56.96 : x
  2. Step 2: Convert to fraction form
    74.88/112.80 = 56.96/x
  3. Step 3: Cross multiply
    74.88x = 112.80 × 56.96
  4. Step 4: Simplify right side
    74.88x = 6,425.09
  5. Step 5: Solve for x
    x = 6,425.09/74.88
  6. Step 6: Final answer
    x = 85.81

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.