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Finding the Fourth Proportional to 20,591.98, 28,401.90 and 13,039.54

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Solution

The fourth proportional to 20,591.98, 28,401.90 and 13,039.54 is: 17,985.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,591.98 : 28,401.90 = 13,039.54 : x
  2. Step 2: Convert to fraction form
    20,591.98/28,401.90 = 13,039.54/x
  3. Step 3: Cross multiply
    20,591.98x = 28,401.90 × 13,039.54
  4. Step 4: Simplify right side
    20,591.98x = 370,347,711.13
  5. Step 5: Solve for x
    x = 370,347,711.13/20,591.98
  6. Step 6: Final answer
    x = 17,985.05

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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.