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Finding the Fourth Proportional to 1,139.55, 1,709.31 and 359.61

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Solution

The fourth proportional to 1,139.55, 1,709.31 and 359.61 is: 539.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.55 : 1,709.31 = 359.61 : x
  2. Step 2: Convert to fraction form
    1,139.55/1,709.31 = 359.61/x
  3. Step 3: Cross multiply
    1,139.55x = 1,709.31 × 359.61
  4. Step 4: Simplify right side
    1,139.55x = 614,684.97
  5. Step 5: Solve for x
    x = 614,684.97/1,139.55
  6. Step 6: Final answer
    x = 539.41

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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.