Home / 6,439.20-9,658.80-4,979.40

Finding the Fourth Proportional to 6,439.20, 9,658.80 and 4,979.40

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Solution

The fourth proportional to 6,439.20, 9,658.80 and 4,979.40 is: 7,469.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,439.20 : 9,658.80 = 4,979.40 : x
  2. Step 2: Convert to fraction form
    6,439.20/9,658.80 = 4,979.40/x
  3. Step 3: Cross multiply
    6,439.20x = 9,658.80 × 4,979.40
  4. Step 4: Simplify right side
    6,439.20x = 48,095,028.72
  5. Step 5: Solve for x
    x = 48,095,028.72/6,439.20
  6. Step 6: Final answer
    x = 7,469.10

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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.