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Finding the Fourth Proportional to 18,831.99, 25,990.45 and 10,874.20

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Solution

The fourth proportional to 18,831.99, 25,990.45 and 10,874.20 is: 15,007.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,831.99 : 25,990.45 = 10,874.20 : x
  2. Step 2: Convert to fraction form
    18,831.99/25,990.45 = 10,874.20/x
  3. Step 3: Cross multiply
    18,831.99x = 25,990.45 × 10,874.20
  4. Step 4: Simplify right side
    18,831.99x = 282,625,297.02
  5. Step 5: Solve for x
    x = 282,625,297.02/18,831.99
  6. Step 6: Final answer
    x = 15,007.73

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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.