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Finding the Fourth Proportional to 2,520.74, 3,781.11 and 789.50

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Solution

The fourth proportional to 2,520.74, 3,781.11 and 789.50 is: 1,184.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,520.74 : 3,781.11 = 789.50 : x
  2. Step 2: Convert to fraction form
    2,520.74/3,781.11 = 789.50/x
  3. Step 3: Cross multiply
    2,520.74x = 3,781.11 × 789.50
  4. Step 4: Simplify right side
    2,520.74x = 2,985,186.35
  5. Step 5: Solve for x
    x = 2,985,186.35/2,520.74
  6. Step 6: Final answer
    x = 1,184.25

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Double scale
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Similar ratio
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1.5x scale

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.