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Finding the Fourth Proportional to 13,390.87, 18,479.13 and 8,085.70

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Solution

The fourth proportional to 13,390.87, 18,479.13 and 8,085.70 is: 11,158.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.87 : 18,479.13 = 8,085.70 : x
  2. Step 2: Convert to fraction form
    13,390.87/18,479.13 = 8,085.70/x
  3. Step 3: Cross multiply
    13,390.87x = 18,479.13 × 8,085.70
  4. Step 4: Simplify right side
    13,390.87x = 149,416,701.44
  5. Step 5: Solve for x
    x = 149,416,701.44/13,390.87
  6. Step 6: Final answer
    x = 11,158.10

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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.