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Finding the Fourth Proportional to 21,040.17, 29,039.19 and 12,542.84

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Solution

The fourth proportional to 21,040.17, 29,039.19 and 12,542.84 is: 17,311.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,040.17 : 29,039.19 = 12,542.84 : x
  2. Step 2: Convert to fraction form
    21,040.17/29,039.19 = 12,542.84/x
  3. Step 3: Cross multiply
    21,040.17x = 29,039.19 × 12,542.84
  4. Step 4: Simplify right side
    21,040.17x = 364,233,895.08
  5. Step 5: Solve for x
    x = 364,233,895.08/21,040.17
  6. Step 6: Final answer
    x = 17,311.36

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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.