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Finding the Fourth Proportional to 1,351.60, 1,865.50 and 878.67

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Solution

The fourth proportional to 1,351.60, 1,865.50 and 878.67 is: 1,212.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.60 : 1,865.50 = 878.67 : x
  2. Step 2: Convert to fraction form
    1,351.60/1,865.50 = 878.67/x
  3. Step 3: Cross multiply
    1,351.60x = 1,865.50 × 878.67
  4. Step 4: Simplify right side
    1,351.60x = 1,639,161.63
  5. Step 5: Solve for x
    x = 1,639,161.63/1,351.60
  6. Step 6: Final answer
    x = 1,212.76

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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.