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Finding the Fourth Proportional to 1,139.58, 1,709.37 and 489.92

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Solution

The fourth proportional to 1,139.58, 1,709.37 and 489.92 is: 734.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.58 : 1,709.37 = 489.92 : x
  2. Step 2: Convert to fraction form
    1,139.58/1,709.37 = 489.92/x
  3. Step 3: Cross multiply
    1,139.58x = 1,709.37 × 489.92
  4. Step 4: Simplify right side
    1,139.58x = 837,446.00
  5. Step 5: Solve for x
    x = 837,446.00/1,139.58
  6. Step 6: Final answer
    x = 734.87

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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.