Home / 15,131.38-20,879.81-8,416.87

Finding the Fourth Proportional to 15,131.38, 20,879.81 and 8,416.87

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Solution

The fourth proportional to 15,131.38, 20,879.81 and 8,416.87 is: 11,614.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,131.38 : 20,879.81 = 8,416.87 : x
  2. Step 2: Convert to fraction form
    15,131.38/20,879.81 = 8,416.87/x
  3. Step 3: Cross multiply
    15,131.38x = 20,879.81 × 8,416.87
  4. Step 4: Simplify right side
    15,131.38x = 175,742,646.39
  5. Step 5: Solve for x
    x = 175,742,646.39/15,131.38
  6. Step 6: Final answer
    x = 11,614.45

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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.