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Finding the Fourth Proportional to 2,690.36, 4,035.78 and 742.57

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Solution

The fourth proportional to 2,690.36, 4,035.78 and 742.57 is: 1,113.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,690.36 : 4,035.78 = 742.57 : x
  2. Step 2: Convert to fraction form
    2,690.36/4,035.78 = 742.57/x
  3. Step 3: Cross multiply
    2,690.36x = 4,035.78 × 742.57
  4. Step 4: Simplify right side
    2,690.36x = 2,996,839.07
  5. Step 5: Solve for x
    x = 2,996,839.07/2,690.36
  6. Step 6: Final answer
    x = 1,113.92

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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.