Home / 1,405.15-2,107.48-515.49

Finding the Fourth Proportional to 1,405.15, 2,107.48 and 515.49

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Solution

The fourth proportional to 1,405.15, 2,107.48 and 515.49 is: 773.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.15 : 2,107.48 = 515.49 : x
  2. Step 2: Convert to fraction form
    1,405.15/2,107.48 = 515.49/x
  3. Step 3: Cross multiply
    1,405.15x = 2,107.48 × 515.49
  4. Step 4: Simplify right side
    1,405.15x = 1,086,388.28
  5. Step 5: Solve for x
    x = 1,086,388.28/1,405.15
  6. Step 6: Final answer
    x = 773.15

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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.