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Finding the Fourth Proportional to 1,201.05, 1,657.32 and 1,112.87

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Solution

The fourth proportional to 1,201.05, 1,657.32 and 1,112.87 is: 1,535.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.05 : 1,657.32 = 1,112.87 : x
  2. Step 2: Convert to fraction form
    1,201.05/1,657.32 = 1,112.87/x
  3. Step 3: Cross multiply
    1,201.05x = 1,657.32 × 1,112.87
  4. Step 4: Simplify right side
    1,201.05x = 1,844,373.42
  5. Step 5: Solve for x
    x = 1,844,373.42/1,201.05
  6. Step 6: Final answer
    x = 1,535.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.