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Finding the Fourth Proportional to 1,261.08, 1,891.62 and 531.18

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Solution

The fourth proportional to 1,261.08, 1,891.62 and 531.18 is: 796.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.08 : 1,891.62 = 531.18 : x
  2. Step 2: Convert to fraction form
    1,261.08/1,891.62 = 531.18/x
  3. Step 3: Cross multiply
    1,261.08x = 1,891.62 × 531.18
  4. Step 4: Simplify right side
    1,261.08x = 1,004,790.71
  5. Step 5: Solve for x
    x = 1,004,790.71/1,261.08
  6. Step 6: Final answer
    x = 796.77

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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.