Home / 8,981.76-13,478.79-3,138.36

Finding the Fourth Proportional to 8,981.76, 13,478.79 and 3,138.36

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Solution

The fourth proportional to 8,981.76, 13,478.79 and 3,138.36 is: 4,709.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,981.76 : 13,478.79 = 3,138.36 : x
  2. Step 2: Convert to fraction form
    8,981.76/13,478.79 = 3,138.36/x
  3. Step 3: Cross multiply
    8,981.76x = 13,478.79 × 3,138.36
  4. Step 4: Simplify right side
    8,981.76x = 42,301,295.38
  5. Step 5: Solve for x
    x = 42,301,295.38/8,981.76
  6. Step 6: Final answer
    x = 4,709.69

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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.