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Finding the Fourth Proportional to 2,185.44, 3,278.16 and 646.56

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Solution

The fourth proportional to 2,185.44, 3,278.16 and 646.56 is: 969.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,185.44 : 3,278.16 = 646.56 : x
  2. Step 2: Convert to fraction form
    2,185.44/3,278.16 = 646.56/x
  3. Step 3: Cross multiply
    2,185.44x = 3,278.16 × 646.56
  4. Step 4: Simplify right side
    2,185.44x = 2,119,527.13
  5. Step 5: Solve for x
    x = 2,119,527.13/2,185.44
  6. Step 6: Final answer
    x = 969.84

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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.