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Finding the Fourth Proportional to 1,139.18, 1,709.67 and 489.92

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Solution

The fourth proportional to 1,139.18, 1,709.67 and 489.92 is: 735.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.18 : 1,709.67 = 489.92 : x
  2. Step 2: Convert to fraction form
    1,139.18/1,709.67 = 489.92/x
  3. Step 3: Cross multiply
    1,139.18x = 1,709.67 × 489.92
  4. Step 4: Simplify right side
    1,139.18x = 837,601.53
  5. Step 5: Solve for x
    x = 837,601.53/1,139.18
  6. Step 6: Final answer
    x = 735.27

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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.