Home / 12,747.60-19,121.40-3,985.20

Finding the Fourth Proportional to 12,747.60, 19,121.40 and 3,985.20

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Solution

The fourth proportional to 12,747.60, 19,121.40 and 3,985.20 is: 5,977.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,747.60 : 19,121.40 = 3,985.20 : x
  2. Step 2: Convert to fraction form
    12,747.60/19,121.40 = 3,985.20/x
  3. Step 3: Cross multiply
    12,747.60x = 19,121.40 × 3,985.20
  4. Step 4: Simplify right side
    12,747.60x = 76,202,603.28
  5. Step 5: Solve for x
    x = 76,202,603.28/12,747.60
  6. Step 6: Final answer
    x = 5,977.80

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1.5x scale

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.