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Finding the Fourth Proportional to 21,640.59, 29,858.09 and 13,135.59

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Solution

The fourth proportional to 21,640.59, 29,858.09 and 13,135.59 is: 18,123.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,640.59 : 29,858.09 = 13,135.59 : x
  2. Step 2: Convert to fraction form
    21,640.59/29,858.09 = 13,135.59/x
  3. Step 3: Cross multiply
    21,640.59x = 29,858.09 × 13,135.59
  4. Step 4: Simplify right side
    21,640.59x = 392,203,562.75
  5. Step 5: Solve for x
    x = 392,203,562.75/21,640.59
  6. Step 6: Final answer
    x = 18,123.52

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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.