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Finding the Fourth Proportional to 1,550.54, 2,139.80 and 851.91

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Solution

The fourth proportional to 1,550.54, 2,139.80 and 851.91 is: 1,175.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,550.54 : 2,139.80 = 851.91 : x
  2. Step 2: Convert to fraction form
    1,550.54/2,139.80 = 851.91/x
  3. Step 3: Cross multiply
    1,550.54x = 2,139.80 × 851.91
  4. Step 4: Simplify right side
    1,550.54x = 1,822,912.76
  5. Step 5: Solve for x
    x = 1,822,912.76/1,550.54
  6. Step 6: Final answer
    x = 1,175.67

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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.