Home / 1,431.26-2,146.90-457.40

Finding the Fourth Proportional to 1,431.26, 2,146.90 and 457.40

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Solution

The fourth proportional to 1,431.26, 2,146.90 and 457.40 is: 686.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.26 : 2,146.90 = 457.40 : x
  2. Step 2: Convert to fraction form
    1,431.26/2,146.90 = 457.40/x
  3. Step 3: Cross multiply
    1,431.26x = 2,146.90 × 457.40
  4. Step 4: Simplify right side
    1,431.26x = 981,992.06
  5. Step 5: Solve for x
    x = 981,992.06/1,431.26
  6. Step 6: Final answer
    x = 686.10

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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.