Home / 6,639.69-9,159.63-4,120.87

Finding the Fourth Proportional to 6,639.69, 9,159.63 and 4,120.87

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Solution

The fourth proportional to 6,639.69, 9,159.63 and 4,120.87 is: 5,684.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,639.69 : 9,159.63 = 4,120.87 : x
  2. Step 2: Convert to fraction form
    6,639.69/9,159.63 = 4,120.87/x
  3. Step 3: Cross multiply
    6,639.69x = 9,159.63 × 4,120.87
  4. Step 4: Simplify right side
    6,639.69x = 37,745,644.48
  5. Step 5: Solve for x
    x = 37,745,644.48/6,639.69
  6. Step 6: Final answer
    x = 5,684.85

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Half scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.