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Finding the Fourth Proportional to 1,326.71, 1,988.94 and 838.67

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Solution

The fourth proportional to 1,326.71, 1,988.94 and 838.67 is: 1,257.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.71 : 1,988.94 = 838.67 : x
  2. Step 2: Convert to fraction form
    1,326.71/1,988.94 = 838.67/x
  3. Step 3: Cross multiply
    1,326.71x = 1,988.94 × 838.67
  4. Step 4: Simplify right side
    1,326.71x = 1,668,064.31
  5. Step 5: Solve for x
    x = 1,668,064.31/1,326.71
  6. Step 6: Final answer
    x = 1,257.29

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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.