Home / 1,513.09-2,270.31-691.21

Finding the Fourth Proportional to 1,513.09, 2,270.31 and 691.21

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Solution

The fourth proportional to 1,513.09, 2,270.31 and 691.21 is: 1,037.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,513.09 : 2,270.31 = 691.21 : x
  2. Step 2: Convert to fraction form
    1,513.09/2,270.31 = 691.21/x
  3. Step 3: Cross multiply
    1,513.09x = 2,270.31 × 691.21
  4. Step 4: Simplify right side
    1,513.09x = 1,569,260.98
  5. Step 5: Solve for x
    x = 1,569,260.98/1,513.09
  6. Step 6: Final answer
    x = 1,037.12

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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.