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Finding the Fourth Proportional to 2,988.56, 4,478.04 and 1,890.32

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Solution

The fourth proportional to 2,988.56, 4,478.04 and 1,890.32 is: 2,832.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,988.56 : 4,478.04 = 1,890.32 : x
  2. Step 2: Convert to fraction form
    2,988.56/4,478.04 = 1,890.32/x
  3. Step 3: Cross multiply
    2,988.56x = 4,478.04 × 1,890.32
  4. Step 4: Simplify right side
    2,988.56x = 8,464,928.57
  5. Step 5: Solve for x
    x = 8,464,928.57/2,988.56
  6. Step 6: Final answer
    x = 2,832.44

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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.