Home / 1,108.11-1,661.77-405.13

Finding the Fourth Proportional to 1,108.11, 1,661.77 and 405.13

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Solution

The fourth proportional to 1,108.11, 1,661.77 and 405.13 is: 607.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.11 : 1,661.77 = 405.13 : x
  2. Step 2: Convert to fraction form
    1,108.11/1,661.77 = 405.13/x
  3. Step 3: Cross multiply
    1,108.11x = 1,661.77 × 405.13
  4. Step 4: Simplify right side
    1,108.11x = 673,227.71
  5. Step 5: Solve for x
    x = 673,227.71/1,108.11
  6. Step 6: Final answer
    x = 607.55

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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.