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Finding the Fourth Proportional to 15,129.68, 20,879.87 and 9,161.90

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Solution

The fourth proportional to 15,129.68, 20,879.87 and 9,161.90 is: 12,643.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,129.68 : 20,879.87 = 9,161.90 : x
  2. Step 2: Convert to fraction form
    15,129.68/20,879.87 = 9,161.90/x
  3. Step 3: Cross multiply
    15,129.68x = 20,879.87 × 9,161.90
  4. Step 4: Simplify right side
    15,129.68x = 191,299,130.74
  5. Step 5: Solve for x
    x = 191,299,130.74/15,129.68
  6. Step 6: Final answer
    x = 12,643.97

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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.