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Finding the Fourth Proportional to 4,947.78, 7,421.49 and 1,660.80

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Solution

The fourth proportional to 4,947.78, 7,421.49 and 1,660.80 is: 2,491.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,947.78 : 7,421.49 = 1,660.80 : x
  2. Step 2: Convert to fraction form
    4,947.78/7,421.49 = 1,660.80/x
  3. Step 3: Cross multiply
    4,947.78x = 7,421.49 × 1,660.80
  4. Step 4: Simplify right side
    4,947.78x = 12,325,610.59
  5. Step 5: Solve for x
    x = 12,325,610.59/4,947.78
  6. Step 6: Final answer
    x = 2,491.14

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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.