Home / 18,688.09-25,785.01-11,129.57

Finding the Fourth Proportional to 18,688.09, 25,785.01 and 11,129.57

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Solution

The fourth proportional to 18,688.09, 25,785.01 and 11,129.57 is: 15,356.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,688.09 : 25,785.01 = 11,129.57 : x
  2. Step 2: Convert to fraction form
    18,688.09/25,785.01 = 11,129.57/x
  3. Step 3: Cross multiply
    18,688.09x = 25,785.01 × 11,129.57
  4. Step 4: Simplify right side
    18,688.09x = 286,976,073.75
  5. Step 5: Solve for x
    x = 286,976,073.75/18,688.09
  6. Step 6: Final answer
    x = 15,356.09

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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.