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Finding the Fourth Proportional to 1,261.29, 1,891.28 and 439.34

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Solution

The fourth proportional to 1,261.29, 1,891.28 and 439.34 is: 658.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.29 : 1,891.28 = 439.34 : x
  2. Step 2: Convert to fraction form
    1,261.29/1,891.28 = 439.34/x
  3. Step 3: Cross multiply
    1,261.29x = 1,891.28 × 439.34
  4. Step 4: Simplify right side
    1,261.29x = 830,903.30
  5. Step 5: Solve for x
    x = 830,903.30/1,261.29
  6. Step 6: Final answer
    x = 658.77

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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.