Home / 21,006.20-28,987.80-11,574.80

Finding the Fourth Proportional to 21,006.20, 28,987.80 and 11,574.80

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Solution

The fourth proportional to 21,006.20, 28,987.80 and 11,574.80 is: 15,972.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.20 : 28,987.80 = 11,574.80 : x
  2. Step 2: Convert to fraction form
    21,006.20/28,987.80 = 11,574.80/x
  3. Step 3: Cross multiply
    21,006.20x = 28,987.80 × 11,574.80
  4. Step 4: Simplify right side
    21,006.20x = 335,527,987.44
  5. Step 5: Solve for x
    x = 335,527,987.44/21,006.20
  6. Step 6: Final answer
    x = 15,972.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.