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Finding the Fourth Proportional to 22,516.80, 31,107.84 and 21,436.80

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Solution

The fourth proportional to 22,516.80, 31,107.84 and 21,436.80 is: 29,615.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,516.80 : 31,107.84 = 21,436.80 : x
  2. Step 2: Convert to fraction form
    22,516.80/31,107.84 = 21,436.80/x
  3. Step 3: Cross multiply
    22,516.80x = 31,107.84 × 21,436.80
  4. Step 4: Simplify right side
    22,516.80x = 666,852,544.51
  5. Step 5: Solve for x
    x = 666,852,544.51/22,516.80
  6. Step 6: Final answer
    x = 29,615.78

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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.