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Finding the Fourth Proportional to 15,105.87, 20,847.51 and 9,139.01

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Solution

The fourth proportional to 15,105.87, 20,847.51 and 9,139.01 is: 12,612.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,105.87 : 20,847.51 = 9,139.01 : x
  2. Step 2: Convert to fraction form
    15,105.87/20,847.51 = 9,139.01/x
  3. Step 3: Cross multiply
    15,105.87x = 20,847.51 × 9,139.01
  4. Step 4: Simplify right side
    15,105.87x = 190,525,498.13
  5. Step 5: Solve for x
    x = 190,525,498.13/15,105.87
  6. Step 6: Final answer
    x = 12,612.68

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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.