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Finding the Fourth Proportional to 3,320.61, 4,980.12 and 979.98

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Solution

The fourth proportional to 3,320.61, 4,980.12 and 979.98 is: 1,469.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,320.61 : 4,980.12 = 979.98 : x
  2. Step 2: Convert to fraction form
    3,320.61/4,980.12 = 979.98/x
  3. Step 3: Cross multiply
    3,320.61x = 4,980.12 × 979.98
  4. Step 4: Simplify right side
    3,320.61x = 4,880,423.66
  5. Step 5: Solve for x
    x = 4,880,423.66/3,320.61
  6. Step 6: Final answer
    x = 1,469.74

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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.