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Finding the Fourth Proportional to 1,191.19, 1,643.80 and 660.05

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Solution

The fourth proportional to 1,191.19, 1,643.80 and 660.05 is: 910.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.19 : 1,643.80 = 660.05 : x
  2. Step 2: Convert to fraction form
    1,191.19/1,643.80 = 660.05/x
  3. Step 3: Cross multiply
    1,191.19x = 1,643.80 × 660.05
  4. Step 4: Simplify right side
    1,191.19x = 1,084,987.72
  5. Step 5: Solve for x
    x = 1,084,987.72/1,191.19
  6. Step 6: Final answer
    x = 910.84

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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.