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Finding the Fourth Proportional to 1,105.05, 1,657.85 and 618.44

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Solution

The fourth proportional to 1,105.05, 1,657.85 and 618.44 is: 927.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.05 : 1,657.85 = 618.44 : x
  2. Step 2: Convert to fraction form
    1,105.05/1,657.85 = 618.44/x
  3. Step 3: Cross multiply
    1,105.05x = 1,657.85 × 618.44
  4. Step 4: Simplify right side
    1,105.05x = 1,025,281.81
  5. Step 5: Solve for x
    x = 1,025,281.81/1,105.05
  6. Step 6: Final answer
    x = 927.81

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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.