Home / 12,928.80-19,364.40-9,991.20

Finding the Fourth Proportional to 12,928.80, 19,364.40 and 9,991.20

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Solution

The fourth proportional to 12,928.80, 19,364.40 and 9,991.20 is: 14,964.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,928.80 : 19,364.40 = 9,991.20 : x
  2. Step 2: Convert to fraction form
    12,928.80/19,364.40 = 9,991.20/x
  3. Step 3: Cross multiply
    12,928.80x = 19,364.40 × 9,991.20
  4. Step 4: Simplify right side
    12,928.80x = 193,473,593.28
  5. Step 5: Solve for x
    x = 193,473,593.28/12,928.80
  6. Step 6: Final answer
    x = 14,964.54

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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.