Home / 13,120.19-18,105.87-7,151.86

Finding the Fourth Proportional to 13,120.19, 18,105.87 and 7,151.86

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Solution

The fourth proportional to 13,120.19, 18,105.87 and 7,151.86 is: 9,869.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,120.19 : 18,105.87 = 7,151.86 : x
  2. Step 2: Convert to fraction form
    13,120.19/18,105.87 = 7,151.86/x
  3. Step 3: Cross multiply
    13,120.19x = 18,105.87 × 7,151.86
  4. Step 4: Simplify right side
    13,120.19x = 129,490,647.42
  5. Step 5: Solve for x
    x = 129,490,647.42/13,120.19
  6. Step 6: Final answer
    x = 9,869.57

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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.