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Finding the Fourth Proportional to 21,129.80, 29,215.50 and 18,505.40

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Solution

The fourth proportional to 21,129.80, 29,215.50 and 18,505.40 is: 25,586.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.80 : 29,215.50 = 18,505.40 : x
  2. Step 2: Convert to fraction form
    21,129.80/29,215.50 = 18,505.40/x
  3. Step 3: Cross multiply
    21,129.80x = 29,215.50 × 18,505.40
  4. Step 4: Simplify right side
    21,129.80x = 540,644,513.70
  5. Step 5: Solve for x
    x = 540,644,513.70/21,129.80
  6. Step 6: Final answer
    x = 25,586.83

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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.