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Finding the Fourth Proportional to 1,112.88, 1,666.08 and 819.36

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Solution

The fourth proportional to 1,112.88, 1,666.08 and 819.36 is: 1,226.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.88 : 1,666.08 = 819.36 : x
  2. Step 2: Convert to fraction form
    1,112.88/1,666.08 = 819.36/x
  3. Step 3: Cross multiply
    1,112.88x = 1,666.08 × 819.36
  4. Step 4: Simplify right side
    1,112.88x = 1,365,119.31
  5. Step 5: Solve for x
    x = 1,365,119.31/1,112.88
  6. Step 6: Final answer
    x = 1,226.65

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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.