Home / 7,981.20-11,971.80-3,048.30

Finding the Fourth Proportional to 7,981.20, 11,971.80 and 3,048.30

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Solution

The fourth proportional to 7,981.20, 11,971.80 and 3,048.30 is: 4,572.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,981.20 : 11,971.80 = 3,048.30 : x
  2. Step 2: Convert to fraction form
    7,981.20/11,971.80 = 3,048.30/x
  3. Step 3: Cross multiply
    7,981.20x = 11,971.80 × 3,048.30
  4. Step 4: Simplify right side
    7,981.20x = 36,493,637.94
  5. Step 5: Solve for x
    x = 36,493,637.94/7,981.20
  6. Step 6: Final answer
    x = 4,572.45

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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.