Home / 1,261.11-1,890.92-520.16

Finding the Fourth Proportional to 1,261.11, 1,890.92 and 520.16

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Solution

The fourth proportional to 1,261.11, 1,890.92 and 520.16 is: 779.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.11 : 1,890.92 = 520.16 : x
  2. Step 2: Convert to fraction form
    1,261.11/1,890.92 = 520.16/x
  3. Step 3: Cross multiply
    1,261.11x = 1,890.92 × 520.16
  4. Step 4: Simplify right side
    1,261.11x = 983,568.89
  5. Step 5: Solve for x
    x = 983,568.89/1,261.11
  6. Step 6: Final answer
    x = 779.92

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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.