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Finding the Fourth Proportional to 1,127.31, 1,690.43 and 640.23

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Solution

The fourth proportional to 1,127.31, 1,690.43 and 640.23 is: 960.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.31 : 1,690.43 = 640.23 : x
  2. Step 2: Convert to fraction form
    1,127.31/1,690.43 = 640.23/x
  3. Step 3: Cross multiply
    1,127.31x = 1,690.43 × 640.23
  4. Step 4: Simplify right side
    1,127.31x = 1,082,260.80
  5. Step 5: Solve for x
    x = 1,082,260.80/1,127.31
  6. Step 6: Final answer
    x = 960.04

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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.