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Finding the Fourth Proportional to 2,988.66, 4,478.30 and 1,890.70

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Solution

The fourth proportional to 2,988.66, 4,478.30 and 1,890.70 is: 2,833.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,988.66 : 4,478.30 = 1,890.70 : x
  2. Step 2: Convert to fraction form
    2,988.66/4,478.30 = 1,890.70/x
  3. Step 3: Cross multiply
    2,988.66x = 4,478.30 × 1,890.70
  4. Step 4: Simplify right side
    2,988.66x = 8,467,120.85
  5. Step 5: Solve for x
    x = 8,467,120.85/2,988.66
  6. Step 6: Final answer
    x = 2,833.09

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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.