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Finding the Fourth Proportional to 7,778.40, 10,729.42 and 4,979.04

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Solution

The fourth proportional to 7,778.40, 10,729.42 and 4,979.04 is: 6,868.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,778.40 : 10,729.42 = 4,979.04 : x
  2. Step 2: Convert to fraction form
    7,778.40/10,729.42 = 4,979.04/x
  3. Step 3: Cross multiply
    7,778.40x = 10,729.42 × 4,979.04
  4. Step 4: Simplify right side
    7,778.40x = 53,422,211.36
  5. Step 5: Solve for x
    x = 53,422,211.36/7,778.40
  6. Step 6: Final answer
    x = 6,868.02

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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.