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Finding the Fourth Proportional to 4,751.28, 7,127.28 and 1,288.48

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Solution

The fourth proportional to 4,751.28, 7,127.28 and 1,288.48 is: 1,932.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,751.28 : 7,127.28 = 1,288.48 : x
  2. Step 2: Convert to fraction form
    4,751.28/7,127.28 = 1,288.48/x
  3. Step 3: Cross multiply
    4,751.28x = 7,127.28 × 1,288.48
  4. Step 4: Simplify right side
    4,751.28x = 9,183,357.73
  5. Step 5: Solve for x
    x = 9,183,357.73/4,751.28
  6. Step 6: Final answer
    x = 1,932.82

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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.