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Finding the Fourth Proportional to 1,201.70, 1,802.55 and 1,112.60

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Solution

The fourth proportional to 1,201.70, 1,802.55 and 1,112.60 is: 1,668.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.70 : 1,802.55 = 1,112.60 : x
  2. Step 2: Convert to fraction form
    1,201.70/1,802.55 = 1,112.60/x
  3. Step 3: Cross multiply
    1,201.70x = 1,802.55 × 1,112.60
  4. Step 4: Simplify right side
    1,201.70x = 2,005,517.13
  5. Step 5: Solve for x
    x = 2,005,517.13/1,201.70
  6. Step 6: Final answer
    x = 1,668.90

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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.