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Finding the Fourth Proportional to 2,159.50, 2,980.14 and 1,228

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Solution

The fourth proportional to 2,159.50, 2,980.14 and 1,228 is: 1,694.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,159.50 : 2,980.14 = 1,228 : x
  2. Step 2: Convert to fraction form
    2,159.50/2,980.14 = 1,228/x
  3. Step 3: Cross multiply
    2,159.50x = 2,980.14 × 1,228
  4. Step 4: Simplify right side
    2,159.50x = 3,659,611.92
  5. Step 5: Solve for x
    x = 3,659,611.92/2,159.50
  6. Step 6: Final answer
    x = 1,694.66

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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.