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Finding the Fourth Proportional to 21,767.88, 30,039.70 and 11,831.88

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Solution

The fourth proportional to 21,767.88, 30,039.70 and 11,831.88 is: 16,328.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,767.88 : 30,039.70 = 11,831.88 : x
  2. Step 2: Convert to fraction form
    21,767.88/30,039.70 = 11,831.88/x
  3. Step 3: Cross multiply
    21,767.88x = 30,039.70 × 11,831.88
  4. Step 4: Simplify right side
    21,767.88x = 355,426,125.64
  5. Step 5: Solve for x
    x = 355,426,125.64/21,767.88
  6. Step 6: Final answer
    x = 16,328.01

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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.