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Finding the Fourth Proportional to 2,978.97, 4,465.38 and 2,155.20

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Solution

The fourth proportional to 2,978.97, 4,465.38 and 2,155.20 is: 3,230.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,978.97 : 4,465.38 = 2,155.20 : x
  2. Step 2: Convert to fraction form
    2,978.97/4,465.38 = 2,155.20/x
  3. Step 3: Cross multiply
    2,978.97x = 4,465.38 × 2,155.20
  4. Step 4: Simplify right side
    2,978.97x = 9,623,786.98
  5. Step 5: Solve for x
    x = 9,623,786.98/2,978.97
  6. Step 6: Final answer
    x = 3,230.58

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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.