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Finding the Fourth Proportional to 1,190.85, 1,642.59 and 911.13

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Solution

The fourth proportional to 1,190.85, 1,642.59 and 911.13 is: 1,256.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.85 : 1,642.59 = 911.13 : x
  2. Step 2: Convert to fraction form
    1,190.85/1,642.59 = 911.13/x
  3. Step 3: Cross multiply
    1,190.85x = 1,642.59 × 911.13
  4. Step 4: Simplify right side
    1,190.85x = 1,496,613.03
  5. Step 5: Solve for x
    x = 1,496,613.03/1,190.85
  6. Step 6: Final answer
    x = 1,256.76

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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.