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Finding the Fourth Proportional to 1,189.53, 1,650.51 and 1,155.51

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Solution

The fourth proportional to 1,189.53, 1,650.51 and 1,155.51 is: 1,603.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.53 : 1,650.51 = 1,155.51 : x
  2. Step 2: Convert to fraction form
    1,189.53/1,650.51 = 1,155.51/x
  3. Step 3: Cross multiply
    1,189.53x = 1,650.51 × 1,155.51
  4. Step 4: Simplify right side
    1,189.53x = 1,907,180.81
  5. Step 5: Solve for x
    x = 1,907,180.81/1,189.53
  6. Step 6: Final answer
    x = 1,603.31

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.