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Finding the Fourth Proportional to 74.88, 103.40 and 48.72

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Solution

The fourth proportional to 74.88, 103.40 and 48.72 is: 67.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.88 : 103.40 = 48.72 : x
  2. Step 2: Convert to fraction form
    74.88/103.40 = 48.72/x
  3. Step 3: Cross multiply
    74.88x = 103.40 × 48.72
  4. Step 4: Simplify right side
    74.88x = 5,037.65
  5. Step 5: Solve for x
    x = 5,037.65/74.88
  6. Step 6: Final answer
    x = 67.28

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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.