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Finding the Fourth Proportional to 1,009.72, 1,515.66 and 819.64

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Solution

The fourth proportional to 1,009.72, 1,515.66 and 819.64 is: 1,230.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.72 : 1,515.66 = 819.64 : x
  2. Step 2: Convert to fraction form
    1,009.72/1,515.66 = 819.64/x
  3. Step 3: Cross multiply
    1,009.72x = 1,515.66 × 819.64
  4. Step 4: Simplify right side
    1,009.72x = 1,242,295.56
  5. Step 5: Solve for x
    x = 1,242,295.56/1,009.72
  6. Step 6: Final answer
    x = 1,230.34

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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.