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Finding the Fourth Proportional to 1,261.50, 1,892.55 and 439.78

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Solution

The fourth proportional to 1,261.50, 1,892.55 and 439.78 is: 659.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.50 : 1,892.55 = 439.78 : x
  2. Step 2: Convert to fraction form
    1,261.50/1,892.55 = 439.78/x
  3. Step 3: Cross multiply
    1,261.50x = 1,892.55 × 439.78
  4. Step 4: Simplify right side
    1,261.50x = 832,296.18
  5. Step 5: Solve for x
    x = 832,296.18/1,261.50
  6. Step 6: Final answer
    x = 659.77

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Double scale
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1.5x scale

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.