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Finding the Fourth Proportional to 6,668.80, 9,990.40 and 3,929.60

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Solution

The fourth proportional to 6,668.80, 9,990.40 and 3,929.60 is: 5,886.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,668.80 : 9,990.40 = 3,929.60 : x
  2. Step 2: Convert to fraction form
    6,668.80/9,990.40 = 3,929.60/x
  3. Step 3: Cross multiply
    6,668.80x = 9,990.40 × 3,929.60
  4. Step 4: Simplify right side
    6,668.80x = 39,258,275.84
  5. Step 5: Solve for x
    x = 39,258,275.84/6,668.80
  6. Step 6: Final answer
    x = 5,886.86

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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.