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Finding the Fourth Proportional to 9,145.87, 13,636.85 and 8,979.80

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Solution

The fourth proportional to 9,145.87, 13,636.85 and 8,979.80 is: 13,389.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,145.87 : 13,636.85 = 8,979.80 : x
  2. Step 2: Convert to fraction form
    9,145.87/13,636.85 = 8,979.80/x
  3. Step 3: Cross multiply
    9,145.87x = 13,636.85 × 8,979.80
  4. Step 4: Simplify right side
    9,145.87x = 122,456,185.63
  5. Step 5: Solve for x
    x = 122,456,185.63/9,145.87
  6. Step 6: Final answer
    x = 13,389.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.