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Finding the Fourth Proportional to 3,607.90, 4,979.04 and 2,978.12

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Solution

The fourth proportional to 3,607.90, 4,979.04 and 2,978.12 is: 4,109.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,607.90 : 4,979.04 = 2,978.12 : x
  2. Step 2: Convert to fraction form
    3,607.90/4,979.04 = 2,978.12/x
  3. Step 3: Cross multiply
    3,607.90x = 4,979.04 × 2,978.12
  4. Step 4: Simplify right side
    3,607.90x = 14,828,179.88
  5. Step 5: Solve for x
    x = 14,828,179.88/3,607.90
  6. Step 6: Final answer
    x = 4,109.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.