Home / 1,431.28-2,146.78-457.21

Finding the Fourth Proportional to 1,431.28, 2,146.78 and 457.21

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Solution

The fourth proportional to 1,431.28, 2,146.78 and 457.21 is: 685.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.28 : 2,146.78 = 457.21 : x
  2. Step 2: Convert to fraction form
    1,431.28/2,146.78 = 457.21/x
  3. Step 3: Cross multiply
    1,431.28x = 2,146.78 × 457.21
  4. Step 4: Simplify right side
    1,431.28x = 981,529.28
  5. Step 5: Solve for x
    x = 981,529.28/1,431.28
  6. Step 6: Final answer
    x = 685.77

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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.