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Finding the Fourth Proportional to 1,261.54, 1,891.23 and 491.50

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Solution

The fourth proportional to 1,261.54, 1,891.23 and 491.50 is: 736.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.54 : 1,891.23 = 491.50 : x
  2. Step 2: Convert to fraction form
    1,261.54/1,891.23 = 491.50/x
  3. Step 3: Cross multiply
    1,261.54x = 1,891.23 × 491.50
  4. Step 4: Simplify right side
    1,261.54x = 929,539.55
  5. Step 5: Solve for x
    x = 929,539.55/1,261.54
  6. Step 6: Final answer
    x = 736.83

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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.