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Finding the Fourth Proportional to 2,690.41, 4,035.85 and 742.61

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Solution

The fourth proportional to 2,690.41, 4,035.85 and 742.61 is: 1,113.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,690.41 : 4,035.85 = 742.61 : x
  2. Step 2: Convert to fraction form
    2,690.41/4,035.85 = 742.61/x
  3. Step 3: Cross multiply
    2,690.41x = 4,035.85 × 742.61
  4. Step 4: Simplify right side
    2,690.41x = 2,997,070.80
  5. Step 5: Solve for x
    x = 2,997,070.80/2,690.41
  6. Step 6: Final answer
    x = 1,113.98

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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.