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Finding the Fourth Proportional to 2,710.56, 4,065.20 and 978.56

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Solution

The fourth proportional to 2,710.56, 4,065.20 and 978.56 is: 1,467.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,710.56 : 4,065.20 = 978.56 : x
  2. Step 2: Convert to fraction form
    2,710.56/4,065.20 = 978.56/x
  3. Step 3: Cross multiply
    2,710.56x = 4,065.20 × 978.56
  4. Step 4: Simplify right side
    2,710.56x = 3,978,042.11
  5. Step 5: Solve for x
    x = 3,978,042.11/2,710.56
  6. Step 6: Final answer
    x = 1,467.61

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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.