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Finding the Fourth Proportional to 3,320.53, 4,980.08 and 979.90

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Solution

The fourth proportional to 3,320.53, 4,980.08 and 979.90 is: 1,469.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,320.53 : 4,980.08 = 979.90 : x
  2. Step 2: Convert to fraction form
    3,320.53/4,980.08 = 979.90/x
  3. Step 3: Cross multiply
    3,320.53x = 4,980.08 × 979.90
  4. Step 4: Simplify right side
    3,320.53x = 4,879,970.39
  5. Step 5: Solve for x
    x = 4,879,970.39/3,320.53
  6. Step 6: Final answer
    x = 1,469.64

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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.