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Finding the Fourth Proportional to 74.88, 103.36 and 57.64

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Solution

The fourth proportional to 74.88, 103.36 and 57.64 is: 79.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.88 : 103.36 = 57.64 : x
  2. Step 2: Convert to fraction form
    74.88/103.36 = 57.64/x
  3. Step 3: Cross multiply
    74.88x = 103.36 × 57.64
  4. Step 4: Simplify right side
    74.88x = 5,957.67
  5. Step 5: Solve for x
    x = 5,957.67/74.88
  6. Step 6: Final answer
    x = 79.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.