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Finding the Fourth Proportional to 3,320.40, 4,978.80 and 1,372.80

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Solution

The fourth proportional to 3,320.40, 4,978.80 and 1,372.80 is: 2,058.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,320.40 : 4,978.80 = 1,372.80 : x
  2. Step 2: Convert to fraction form
    3,320.40/4,978.80 = 1,372.80/x
  3. Step 3: Cross multiply
    3,320.40x = 4,978.80 × 1,372.80
  4. Step 4: Simplify right side
    3,320.40x = 6,834,896.64
  5. Step 5: Solve for x
    x = 6,834,896.64/3,320.40
  6. Step 6: Final answer
    x = 2,058.46

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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.