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Finding the Fourth Proportional to 1,121.89, 1,683.11 and 660.06

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Solution

The fourth proportional to 1,121.89, 1,683.11 and 660.06 is: 990.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.89 : 1,683.11 = 660.06 : x
  2. Step 2: Convert to fraction form
    1,121.89/1,683.11 = 660.06/x
  3. Step 3: Cross multiply
    1,121.89x = 1,683.11 × 660.06
  4. Step 4: Simplify right side
    1,121.89x = 1,110,953.59
  5. Step 5: Solve for x
    x = 1,110,953.59/1,121.89
  6. Step 6: Final answer
    x = 990.25

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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.