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Finding the Fourth Proportional to 1,261.46, 1,892.45 and 439.77

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Solution

The fourth proportional to 1,261.46, 1,892.45 and 439.77 is: 659.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.46 : 1,892.45 = 439.77 : x
  2. Step 2: Convert to fraction form
    1,261.46/1,892.45 = 439.77/x
  3. Step 3: Cross multiply
    1,261.46x = 1,892.45 × 439.77
  4. Step 4: Simplify right side
    1,261.46x = 832,242.74
  5. Step 5: Solve for x
    x = 832,242.74/1,261.46
  6. Step 6: Final answer
    x = 659.75

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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.