Home / 1,260.72-1,890.38-520.13

Finding the Fourth Proportional to 1,260.72, 1,890.38 and 520.13

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Solution

The fourth proportional to 1,260.72, 1,890.38 and 520.13 is: 779.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.72 : 1,890.38 = 520.13 : x
  2. Step 2: Convert to fraction form
    1,260.72/1,890.38 = 520.13/x
  3. Step 3: Cross multiply
    1,260.72x = 1,890.38 × 520.13
  4. Step 4: Simplify right side
    1,260.72x = 983,249.38
  5. Step 5: Solve for x
    x = 983,249.38/1,260.72
  6. Step 6: Final answer
    x = 779.91

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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.