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Finding the Fourth Proportional to 1,191.24, 1,643.63 and 911.79

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Solution

The fourth proportional to 1,191.24, 1,643.63 and 911.79 is: 1,258.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.24 : 1,643.63 = 911.79 : x
  2. Step 2: Convert to fraction form
    1,191.24/1,643.63 = 911.79/x
  3. Step 3: Cross multiply
    1,191.24x = 1,643.63 × 911.79
  4. Step 4: Simplify right side
    1,191.24x = 1,498,640.84
  5. Step 5: Solve for x
    x = 1,498,640.84/1,191.24
  6. Step 6: Final answer
    x = 1,258.05

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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.