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Finding the Fourth Proportional to 3,165, 4,747.50 and 856.50

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Solution

The fourth proportional to 3,165, 4,747.50 and 856.50 is: 1,284.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,165 : 4,747.50 = 856.50 : x
  2. Step 2: Convert to fraction form
    3,165/4,747.50 = 856.50/x
  3. Step 3: Cross multiply
    3,165x = 4,747.50 × 856.50
  4. Step 4: Simplify right side
    3,165x = 4,066,233.75
  5. Step 5: Solve for x
    x = 4,066,233.75/3,165
  6. Step 6: Final answer
    x = 1,284.75

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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.