Home / 12,871.20-19,306.80-9,112.80

Finding the Fourth Proportional to 12,871.20, 19,306.80 and 9,112.80

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Solution

The fourth proportional to 12,871.20, 19,306.80 and 9,112.80 is: 13,669.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,871.20 : 19,306.80 = 9,112.80 : x
  2. Step 2: Convert to fraction form
    12,871.20/19,306.80 = 9,112.80/x
  3. Step 3: Cross multiply
    12,871.20x = 19,306.80 × 9,112.80
  4. Step 4: Simplify right side
    12,871.20x = 175,939,007.04
  5. Step 5: Solve for x
    x = 175,939,007.04/12,871.20
  6. Step 6: Final answer
    x = 13,669.20

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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.