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Finding the Fourth Proportional to 866.40, 1,299.51 and 455.37

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Solution

The fourth proportional to 866.40, 1,299.51 and 455.37 is: 683.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.40 : 1,299.51 = 455.37 : x
  2. Step 2: Convert to fraction form
    866.40/1,299.51 = 455.37/x
  3. Step 3: Cross multiply
    866.40x = 1,299.51 × 455.37
  4. Step 4: Simplify right side
    866.40x = 591,757.87
  5. Step 5: Solve for x
    x = 591,757.87/866.40
  6. Step 6: Final answer
    x = 683.01

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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.