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Finding the Fourth Proportional to 2,135.16, 3,203.31 and 980.64

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Solution

The fourth proportional to 2,135.16, 3,203.31 and 980.64 is: 1,471.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,135.16 : 3,203.31 = 980.64 : x
  2. Step 2: Convert to fraction form
    2,135.16/3,203.31 = 980.64/x
  3. Step 3: Cross multiply
    2,135.16x = 3,203.31 × 980.64
  4. Step 4: Simplify right side
    2,135.16x = 3,141,293.92
  5. Step 5: Solve for x
    x = 3,141,293.92/2,135.16
  6. Step 6: Final answer
    x = 1,471.22

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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.