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Finding the Fourth Proportional to 1,239.84, 1,722.20 and 1,220.00

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Solution

The fourth proportional to 1,239.84, 1,722.20 and 1,220.00 is: 1,694.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.84 : 1,722.20 = 1,220.00 : x
  2. Step 2: Convert to fraction form
    1,239.84/1,722.20 = 1,220.00/x
  3. Step 3: Cross multiply
    1,239.84x = 1,722.20 × 1,220.00
  4. Step 4: Simplify right side
    1,239.84x = 2,101,069.29
  5. Step 5: Solve for x
    x = 2,101,069.29/1,239.84
  6. Step 6: Final answer
    x = 1,694.63

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.