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Finding the Fourth Proportional to 719.92, 1,080.81 and 489.37

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Solution

The fourth proportional to 719.92, 1,080.81 and 489.37 is: 734.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.92 : 1,080.81 = 489.37 : x
  2. Step 2: Convert to fraction form
    719.92/1,080.81 = 489.37/x
  3. Step 3: Cross multiply
    719.92x = 1,080.81 × 489.37
  4. Step 4: Simplify right side
    719.92x = 528,915.99
  5. Step 5: Solve for x
    x = 528,915.99/719.92
  6. Step 6: Final answer
    x = 734.69

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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.