Home / 20,911.45-31,359.00-7,581.28

Finding the Fourth Proportional to 20,911.45, 31,359.00 and 7,581.28

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Solution

The fourth proportional to 20,911.45, 31,359.00 and 7,581.28 is: 11,368.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.45 : 31,359.00 = 7,581.28 : x
  2. Step 2: Convert to fraction form
    20,911.45/31,359.00 = 7,581.28/x
  3. Step 3: Cross multiply
    20,911.45x = 31,359.00 × 7,581.28
  4. Step 4: Simplify right side
    20,911.45x = 237,741,325.71
  5. Step 5: Solve for x
    x = 237,741,325.71/20,911.45
  6. Step 6: Final answer
    x = 11,368.95

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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.