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Finding the Fourth Proportional to 1,131.12, 1,695.51 and 668.81

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Solution

The fourth proportional to 1,131.12, 1,695.51 and 668.81 is: 1,002.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.12 : 1,695.51 = 668.81 : x
  2. Step 2: Convert to fraction form
    1,131.12/1,695.51 = 668.81/x
  3. Step 3: Cross multiply
    1,131.12x = 1,695.51 × 668.81
  4. Step 4: Simplify right side
    1,131.12x = 1,133,965.57
  5. Step 5: Solve for x
    x = 1,133,965.57/1,131.12
  6. Step 6: Final answer
    x = 1,002.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.