Home / 260,128.28-390,192.57-73,139.78

Finding the Fourth Proportional to 260,128.28, 390,192.57 and 73,139.78

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Solution

The fourth proportional to 260,128.28, 390,192.57 and 73,139.78 is: 109,709.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,128.28 : 390,192.57 = 73,139.78 : x
  2. Step 2: Convert to fraction form
    260,128.28/390,192.57 = 73,139.78/x
  3. Step 3: Cross multiply
    260,128.28x = 390,192.57 × 73,139.78
  4. Step 4: Simplify right side
    260,128.28x = 28,538,598,727.43
  5. Step 5: Solve for x
    x = 28,538,598,727.43/260,128.28
  6. Step 6: Final answer
    x = 109,709.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.