Home / 20,990.72-28,993.20-15,239.00

Finding the Fourth Proportional to 20,990.72, 28,993.20 and 15,239.00

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Solution

The fourth proportional to 20,990.72, 28,993.20 and 15,239.00 is: 21,048.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.72 : 28,993.20 = 15,239.00 : x
  2. Step 2: Convert to fraction form
    20,990.72/28,993.20 = 15,239.00/x
  3. Step 3: Cross multiply
    20,990.72x = 28,993.20 × 15,239.00
  4. Step 4: Simplify right side
    20,990.72x = 441,827,229.83
  5. Step 5: Solve for x
    x = 441,827,229.83/20,990.72
  6. Step 6: Final answer
    x = 21,048.70

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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.