Home / 1,431.40-2,147.34-457.36

Finding the Fourth Proportional to 1,431.40, 2,147.34 and 457.36

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Solution

The fourth proportional to 1,431.40, 2,147.34 and 457.36 is: 686.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.40 : 2,147.34 = 457.36 : x
  2. Step 2: Convert to fraction form
    1,431.40/2,147.34 = 457.36/x
  3. Step 3: Cross multiply
    1,431.40x = 2,147.34 × 457.36
  4. Step 4: Simplify right side
    1,431.40x = 982,107.42
  5. Step 5: Solve for x
    x = 982,107.42/1,431.40
  6. Step 6: Final answer
    x = 686.12

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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.