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Finding the Fourth Proportional to 2,185.40, 3,277.92 and 646.40

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Solution

The fourth proportional to 2,185.40, 3,277.92 and 646.40 is: 969.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,185.40 : 3,277.92 = 646.40 : x
  2. Step 2: Convert to fraction form
    2,185.40/3,277.92 = 646.40/x
  3. Step 3: Cross multiply
    2,185.40x = 3,277.92 × 646.40
  4. Step 4: Simplify right side
    2,185.40x = 2,118,847.49
  5. Step 5: Solve for x
    x = 2,118,847.49/2,185.40
  6. Step 6: Final answer
    x = 969.55

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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.