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Finding the Fourth Proportional to 1,121.56, 1,681.37 and 496.38

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Solution

The fourth proportional to 1,121.56, 1,681.37 and 496.38 is: 744.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.56 : 1,681.37 = 496.38 : x
  2. Step 2: Convert to fraction form
    1,121.56/1,681.37 = 496.38/x
  3. Step 3: Cross multiply
    1,121.56x = 1,681.37 × 496.38
  4. Step 4: Simplify right side
    1,121.56x = 834,598.44
  5. Step 5: Solve for x
    x = 834,598.44/1,121.56
  6. Step 6: Final answer
    x = 744.14

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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.