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Finding the Fourth Proportional to 2,927.78, 4,390.04 and 978.92

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Solution

The fourth proportional to 2,927.78, 4,390.04 and 978.92 is: 1,467.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,927.78 : 4,390.04 = 978.92 : x
  2. Step 2: Convert to fraction form
    2,927.78/4,390.04 = 978.92/x
  3. Step 3: Cross multiply
    2,927.78x = 4,390.04 × 978.92
  4. Step 4: Simplify right side
    2,927.78x = 4,297,497.96
  5. Step 5: Solve for x
    x = 4,297,497.96/2,927.78
  6. Step 6: Final answer
    x = 1,467.84

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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.