Home / 39,715.38-54,807.20-21,811.51

Finding the Fourth Proportional to 39,715.38, 54,807.20 and 21,811.51

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Solution

The fourth proportional to 39,715.38, 54,807.20 and 21,811.51 is: 30,099.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,715.38 : 54,807.20 = 21,811.51 : x
  2. Step 2: Convert to fraction form
    39,715.38/54,807.20 = 21,811.51/x
  3. Step 3: Cross multiply
    39,715.38x = 54,807.20 × 21,811.51
  4. Step 4: Simplify right side
    39,715.38x = 1,195,427,832.12
  5. Step 5: Solve for x
    x = 1,195,427,832.12/39,715.38
  6. Step 6: Final answer
    x = 30,099.87

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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.