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Finding the Fourth Proportional to 21,561.68, 29,689.80 and 18,410.96

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Solution

The fourth proportional to 21,561.68, 29,689.80 and 18,410.96 is: 25,351.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,561.68 : 29,689.80 = 18,410.96 : x
  2. Step 2: Convert to fraction form
    21,561.68/29,689.80 = 18,410.96/x
  3. Step 3: Cross multiply
    21,561.68x = 29,689.80 × 18,410.96
  4. Step 4: Simplify right side
    21,561.68x = 546,617,720.21
  5. Step 5: Solve for x
    x = 546,617,720.21/21,561.68
  6. Step 6: Final answer
    x = 25,351.35

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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.