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Finding the Fourth Proportional to 21,611.81, 29,831.67 and 12,662.16

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Solution

The fourth proportional to 21,611.81, 29,831.67 and 12,662.16 is: 17,478.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,611.81 : 29,831.67 = 12,662.16 : x
  2. Step 2: Convert to fraction form
    21,611.81/29,831.67 = 12,662.16/x
  3. Step 3: Cross multiply
    21,611.81x = 29,831.67 × 12,662.16
  4. Step 4: Simplify right side
    21,611.81x = 377,733,378.61
  5. Step 5: Solve for x
    x = 377,733,378.61/21,611.81
  6. Step 6: Final answer
    x = 17,478.10

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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.