Home / 13,121.91-18,106.29-7,816.59

Finding the Fourth Proportional to 13,121.91, 18,106.29 and 7,816.59

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Solution

The fourth proportional to 13,121.91, 18,106.29 and 7,816.59 is: 10,785.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.91 : 18,106.29 = 7,816.59 : x
  2. Step 2: Convert to fraction form
    13,121.91/18,106.29 = 7,816.59/x
  3. Step 3: Cross multiply
    13,121.91x = 18,106.29 × 7,816.59
  4. Step 4: Simplify right side
    13,121.91x = 141,529,445.35
  5. Step 5: Solve for x
    x = 141,529,445.35/13,121.91
  6. Step 6: Final answer
    x = 10,785.74

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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.