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Finding the Fourth Proportional to 866.35, 1,299.43 and 815.59

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Solution

The fourth proportional to 866.35, 1,299.43 and 815.59 is: 1,223.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.35 : 1,299.43 = 815.59 : x
  2. Step 2: Convert to fraction form
    866.35/1,299.43 = 815.59/x
  3. Step 3: Cross multiply
    866.35x = 1,299.43 × 815.59
  4. Step 4: Simplify right side
    866.35x = 1,059,802.11
  5. Step 5: Solve for x
    x = 1,059,802.11/866.35
  6. Step 6: Final answer
    x = 1,223.30

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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.