Home / 12,985.20-19,440-9,712.80

Finding the Fourth Proportional to 12,985.20, 19,440 and 9,712.80

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Solution

The fourth proportional to 12,985.20, 19,440 and 9,712.80 is: 14,540.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,985.20 : 19,440 = 9,712.80 : x
  2. Step 2: Convert to fraction form
    12,985.20/19,440 = 9,712.80/x
  3. Step 3: Cross multiply
    12,985.20x = 19,440 × 9,712.80
  4. Step 4: Simplify right side
    12,985.20x = 188,816,832
  5. Step 5: Solve for x
    x = 188,816,832/12,985.20
  6. Step 6: Final answer
    x = 14,540.93

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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.