Home / 1,081.23-1,491.20-666.51

Finding the Fourth Proportional to 1,081.23, 1,491.20 and 666.51

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Solution

The fourth proportional to 1,081.23, 1,491.20 and 666.51 is: 919.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.23 : 1,491.20 = 666.51 : x
  2. Step 2: Convert to fraction form
    1,081.23/1,491.20 = 666.51/x
  3. Step 3: Cross multiply
    1,081.23x = 1,491.20 × 666.51
  4. Step 4: Simplify right side
    1,081.23x = 993,896.38
  5. Step 5: Solve for x
    x = 993,896.38/1,081.23
  6. Step 6: Final answer
    x = 919.23

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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.