Home / 13,355.52-20,045.44-7,120.80

Finding the Fourth Proportional to 13,355.52, 20,045.44 and 7,120.80

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Solution

The fourth proportional to 13,355.52, 20,045.44 and 7,120.80 is: 10,687.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,355.52 : 20,045.44 = 7,120.80 : x
  2. Step 2: Convert to fraction form
    13,355.52/20,045.44 = 7,120.80/x
  3. Step 3: Cross multiply
    13,355.52x = 20,045.44 × 7,120.80
  4. Step 4: Simplify right side
    13,355.52x = 142,739,569.15
  5. Step 5: Solve for x
    x = 142,739,569.15/13,355.52
  6. Step 6: Final answer
    x = 10,687.68

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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.