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Finding the Fourth Proportional to 2,528.08, 3,789.90 and 988

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Solution

The fourth proportional to 2,528.08, 3,789.90 and 988 is: 1,481.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,528.08 : 3,789.90 = 988 : x
  2. Step 2: Convert to fraction form
    2,528.08/3,789.90 = 988/x
  3. Step 3: Cross multiply
    2,528.08x = 3,789.90 × 988
  4. Step 4: Simplify right side
    2,528.08x = 3,744,421.20
  5. Step 5: Solve for x
    x = 3,744,421.20/2,528.08
  6. Step 6: Final answer
    x = 1,481.13

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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.