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Finding the Fourth Proportional to 1,112.92, 1,665.70 and 618.56

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Solution

The fourth proportional to 1,112.92, 1,665.70 and 618.56 is: 925.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.92 : 1,665.70 = 618.56 : x
  2. Step 2: Convert to fraction form
    1,112.92/1,665.70 = 618.56/x
  3. Step 3: Cross multiply
    1,112.92x = 1,665.70 × 618.56
  4. Step 4: Simplify right side
    1,112.92x = 1,030,335.39
  5. Step 5: Solve for x
    x = 1,030,335.39/1,112.92
  6. Step 6: Final answer
    x = 925.79

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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.