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Finding the Fourth Proportional to 1,126.65, 1,690.25 and 664.82

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Solution

The fourth proportional to 1,126.65, 1,690.25 and 664.82 is: 997.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.65 : 1,690.25 = 664.82 : x
  2. Step 2: Convert to fraction form
    1,126.65/1,690.25 = 664.82/x
  3. Step 3: Cross multiply
    1,126.65x = 1,690.25 × 664.82
  4. Step 4: Simplify right side
    1,126.65x = 1,123,700.23
  5. Step 5: Solve for x
    x = 1,123,700.23/1,126.65
  6. Step 6: Final answer
    x = 997.38

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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.