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Finding the Fourth Proportional to 1,261.41, 1,892.10 and 491.91

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Solution

The fourth proportional to 1,261.41, 1,892.10 and 491.91 is: 737.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.41 : 1,892.10 = 491.91 : x
  2. Step 2: Convert to fraction form
    1,261.41/1,892.10 = 491.91/x
  3. Step 3: Cross multiply
    1,261.41x = 1,892.10 × 491.91
  4. Step 4: Simplify right side
    1,261.41x = 930,742.91
  5. Step 5: Solve for x
    x = 930,742.91/1,261.41
  6. Step 6: Final answer
    x = 737.86

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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.