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Finding the Fourth Proportional to 1,261.32, 1,891.96 and 531.40

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Solution

The fourth proportional to 1,261.32, 1,891.96 and 531.40 is: 797.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.32 : 1,891.96 = 531.40 : x
  2. Step 2: Convert to fraction form
    1,261.32/1,891.96 = 531.40/x
  3. Step 3: Cross multiply
    1,261.32x = 1,891.96 × 531.40
  4. Step 4: Simplify right side
    1,261.32x = 1,005,387.54
  5. Step 5: Solve for x
    x = 1,005,387.54/1,261.32
  6. Step 6: Final answer
    x = 797.09

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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.