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Finding the Fourth Proportional to 1,381.79, 1,906.85 and 760.79

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Solution

The fourth proportional to 1,381.79, 1,906.85 and 760.79 is: 1,049.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.79 : 1,906.85 = 760.79 : x
  2. Step 2: Convert to fraction form
    1,381.79/1,906.85 = 760.79/x
  3. Step 3: Cross multiply
    1,381.79x = 1,906.85 × 760.79
  4. Step 4: Simplify right side
    1,381.79x = 1,450,719.08
  5. Step 5: Solve for x
    x = 1,450,719.08/1,381.79
  6. Step 6: Final answer
    x = 1,049.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.