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Finding the Fourth Proportional to 1,190.86, 1,653.28 and 1,155.22

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Solution

The fourth proportional to 1,190.86, 1,653.28 and 1,155.22 is: 1,603.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.86 : 1,653.28 = 1,155.22 : x
  2. Step 2: Convert to fraction form
    1,190.86/1,653.28 = 1,155.22/x
  3. Step 3: Cross multiply
    1,190.86x = 1,653.28 × 1,155.22
  4. Step 4: Simplify right side
    1,190.86x = 1,909,899.43
  5. Step 5: Solve for x
    x = 1,909,899.43/1,190.86
  6. Step 6: Final answer
    x = 1,603.80

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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.