Home / 12,972.80-19,430.40-6,809.60

Finding the Fourth Proportional to 12,972.80, 19,430.40 and 6,809.60

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Solution

The fourth proportional to 12,972.80, 19,430.40 and 6,809.60 is: 10,199.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,972.80 : 19,430.40 = 6,809.60 : x
  2. Step 2: Convert to fraction form
    12,972.80/19,430.40 = 6,809.60/x
  3. Step 3: Cross multiply
    12,972.80x = 19,430.40 × 6,809.60
  4. Step 4: Simplify right side
    12,972.80x = 132,313,251.84
  5. Step 5: Solve for x
    x = 132,313,251.84/12,972.80
  6. Step 6: Final answer
    x = 10,199.28

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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.