Home / 1,239.39-1,706.60-1,212.05

Finding the Fourth Proportional to 1,239.39, 1,706.60 and 1,212.05

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Solution

The fourth proportional to 1,239.39, 1,706.60 and 1,212.05 is: 1,668.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.39 : 1,706.60 = 1,212.05 : x
  2. Step 2: Convert to fraction form
    1,239.39/1,706.60 = 1,212.05/x
  3. Step 3: Cross multiply
    1,239.39x = 1,706.60 × 1,212.05
  4. Step 4: Simplify right side
    1,239.39x = 2,068,491.83
  5. Step 5: Solve for x
    x = 2,068,491.83/1,239.39
  6. Step 6: Final answer
    x = 1,668.96

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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.