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Finding the Fourth Proportional to 13,690.99, 20,538.70 and 5,366.49

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Solution

The fourth proportional to 13,690.99, 20,538.70 and 5,366.49 is: 8,050.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690.99 : 20,538.70 = 5,366.49 : x
  2. Step 2: Convert to fraction form
    13,690.99/20,538.70 = 5,366.49/x
  3. Step 3: Cross multiply
    13,690.99x = 20,538.70 × 5,366.49
  4. Step 4: Simplify right side
    13,690.99x = 110,220,728.16
  5. Step 5: Solve for x
    x = 110,220,728.16/13,690.99
  6. Step 6: Final answer
    x = 8,050.60

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1.5x scale

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.