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Finding the Fourth Proportional to 1,261.59, 1,892.39 and 1,181.40

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Solution

The fourth proportional to 1,261.59, 1,892.39 and 1,181.40 is: 1,772.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.59 : 1,892.39 = 1,181.40 : x
  2. Step 2: Convert to fraction form
    1,261.59/1,892.39 = 1,181.40/x
  3. Step 3: Cross multiply
    1,261.59x = 1,892.39 × 1,181.40
  4. Step 4: Simplify right side
    1,261.59x = 2,235,663.64
  5. Step 5: Solve for x
    x = 2,235,663.64/1,261.59
  6. Step 6: Final answer
    x = 1,772.10

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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.