Home / 6,639.40-9,954.78-3,178.60

Finding the Fourth Proportional to 6,639.40, 9,954.78 and 3,178.60

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Solution

The fourth proportional to 6,639.40, 9,954.78 and 3,178.60 is: 4,765.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,639.40 : 9,954.78 = 3,178.60 : x
  2. Step 2: Convert to fraction form
    6,639.40/9,954.78 = 3,178.60/x
  3. Step 3: Cross multiply
    6,639.40x = 9,954.78 × 3,178.60
  4. Step 4: Simplify right side
    6,639.40x = 31,642,263.71
  5. Step 5: Solve for x
    x = 31,642,263.71/6,639.40
  6. Step 6: Final answer
    x = 4,765.83

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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.