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Finding the Fourth Proportional to 1,391.05, 2,086.44 and 365.05

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Solution

The fourth proportional to 1,391.05, 2,086.44 and 365.05 is: 547.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.05 : 2,086.44 = 365.05 : x
  2. Step 2: Convert to fraction form
    1,391.05/2,086.44 = 365.05/x
  3. Step 3: Cross multiply
    1,391.05x = 2,086.44 × 365.05
  4. Step 4: Simplify right side
    1,391.05x = 761,654.92
  5. Step 5: Solve for x
    x = 761,654.92/1,391.05
  6. Step 6: Final answer
    x = 547.54

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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.