Home / 1,381.08-2,071.26-515.28

Finding the Fourth Proportional to 1,381.08, 2,071.26 and 515.28

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Solution

The fourth proportional to 1,381.08, 2,071.26 and 515.28 is: 772.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.08 : 2,071.26 = 515.28 : x
  2. Step 2: Convert to fraction form
    1,381.08/2,071.26 = 515.28/x
  3. Step 3: Cross multiply
    1,381.08x = 2,071.26 × 515.28
  4. Step 4: Simplify right side
    1,381.08x = 1,067,278.85
  5. Step 5: Solve for x
    x = 1,067,278.85/1,381.08
  6. Step 6: Final answer
    x = 772.79

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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.