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Finding the Fourth Proportional to 66,551.36, 99,831.83 and 20,955.15

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Solution

The fourth proportional to 66,551.36, 99,831.83 and 20,955.15 is: 31,434.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,551.36 : 99,831.83 = 20,955.15 : x
  2. Step 2: Convert to fraction form
    66,551.36/99,831.83 = 20,955.15/x
  3. Step 3: Cross multiply
    66,551.36x = 99,831.83 × 20,955.15
  4. Step 4: Simplify right side
    66,551.36x = 2,091,990,867.65
  5. Step 5: Solve for x
    x = 2,091,990,867.65/66,551.36
  6. Step 6: Final answer
    x = 31,434.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.