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Finding the Fourth Proportional to 1,399.31, 2,099.49 and 577.66

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Solution

The fourth proportional to 1,399.31, 2,099.49 and 577.66 is: 866.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.31 : 2,099.49 = 577.66 : x
  2. Step 2: Convert to fraction form
    1,399.31/2,099.49 = 577.66/x
  3. Step 3: Cross multiply
    1,399.31x = 2,099.49 × 577.66
  4. Step 4: Simplify right side
    1,399.31x = 1,212,778.01
  5. Step 5: Solve for x
    x = 1,212,778.01/1,399.31
  6. Step 6: Final answer
    x = 866.70

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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.