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Finding the Fourth Proportional to 2,647.85, 3,971.74 and 646.55

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Solution

The fourth proportional to 2,647.85, 3,971.74 and 646.55 is: 969.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,647.85 : 3,971.74 = 646.55 : x
  2. Step 2: Convert to fraction form
    2,647.85/3,971.74 = 646.55/x
  3. Step 3: Cross multiply
    2,647.85x = 3,971.74 × 646.55
  4. Step 4: Simplify right side
    2,647.85x = 2,567,928.50
  5. Step 5: Solve for x
    x = 2,567,928.50/2,647.85
  6. Step 6: Final answer
    x = 969.82

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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.