Home / 20,665.72-28,518.78-12,282.28

Finding the Fourth Proportional to 20,665.72, 28,518.78 and 12,282.28

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Solution

The fourth proportional to 20,665.72, 28,518.78 and 12,282.28 is: 16,949.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,665.72 : 28,518.78 = 12,282.28 : x
  2. Step 2: Convert to fraction form
    20,665.72/28,518.78 = 12,282.28/x
  3. Step 3: Cross multiply
    20,665.72x = 28,518.78 × 12,282.28
  4. Step 4: Simplify right side
    20,665.72x = 350,275,641.22
  5. Step 5: Solve for x
    x = 350,275,641.22/20,665.72
  6. Step 6: Final answer
    x = 16,949.60

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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.