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Finding the Fourth Proportional to 1,139.22, 1,709.24 and 398.94

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Solution

The fourth proportional to 1,139.22, 1,709.24 and 398.94 is: 598.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.22 : 1,709.24 = 398.94 : x
  2. Step 2: Convert to fraction form
    1,139.22/1,709.24 = 398.94/x
  3. Step 3: Cross multiply
    1,139.22x = 1,709.24 × 398.94
  4. Step 4: Simplify right side
    1,139.22x = 681,882.21
  5. Step 5: Solve for x
    x = 681,882.21/1,139.22
  6. Step 6: Final answer
    x = 598.55

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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.