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Finding the Fourth Proportional to 30,418.60, 45,725.10 and 21,713.80

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Solution

The fourth proportional to 30,418.60, 45,725.10 and 21,713.80 is: 32,640.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,418.60 : 45,725.10 = 21,713.80 : x
  2. Step 2: Convert to fraction form
    30,418.60/45,725.10 = 21,713.80/x
  3. Step 3: Cross multiply
    30,418.60x = 45,725.10 × 21,713.80
  4. Step 4: Simplify right side
    30,418.60x = 992,865,676.38
  5. Step 5: Solve for x
    x = 992,865,676.38/30,418.60
  6. Step 6: Final answer
    x = 32,640.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.