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Finding the Fourth Proportional to 1,400.78, 2,099.36 and 579.62

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Solution

The fourth proportional to 1,400.78, 2,099.36 and 579.62 is: 868.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,400.78 : 2,099.36 = 579.62 : x
  2. Step 2: Convert to fraction form
    1,400.78/2,099.36 = 579.62/x
  3. Step 3: Cross multiply
    1,400.78x = 2,099.36 × 579.62
  4. Step 4: Simplify right side
    1,400.78x = 1,216,822.00
  5. Step 5: Solve for x
    x = 1,216,822.00/1,400.78
  6. Step 6: Final answer
    x = 868.68

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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.