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Finding the Fourth Proportional to 1,261.66, 1,892.48 and 439.93

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Solution

The fourth proportional to 1,261.66, 1,892.48 and 439.93 is: 659.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.66 : 1,892.48 = 439.93 : x
  2. Step 2: Convert to fraction form
    1,261.66/1,892.48 = 439.93/x
  3. Step 3: Cross multiply
    1,261.66x = 1,892.48 × 439.93
  4. Step 4: Simplify right side
    1,261.66x = 832,560.54
  5. Step 5: Solve for x
    x = 832,560.54/1,261.66
  6. Step 6: Final answer
    x = 659.89

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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.