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Finding the Fourth Proportional to 20,893.70, 28,825.40 and 13,340.39

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Solution

The fourth proportional to 20,893.70, 28,825.40 and 13,340.39 is: 18,404.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,893.70 : 28,825.40 = 13,340.39 : x
  2. Step 2: Convert to fraction form
    20,893.70/28,825.40 = 13,340.39/x
  3. Step 3: Cross multiply
    20,893.70x = 28,825.40 × 13,340.39
  4. Step 4: Simplify right side
    20,893.70x = 384,541,967.13
  5. Step 5: Solve for x
    x = 384,541,967.13/20,893.70
  6. Step 6: Final answer
    x = 18,404.68

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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.