Home / 20,776.11-31,155.95-7,621.30

Finding the Fourth Proportional to 20,776.11, 31,155.95 and 7,621.30

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Solution

The fourth proportional to 20,776.11, 31,155.95 and 7,621.30 is: 11,428.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,776.11 : 31,155.95 = 7,621.30 : x
  2. Step 2: Convert to fraction form
    20,776.11/31,155.95 = 7,621.30/x
  3. Step 3: Cross multiply
    20,776.11x = 31,155.95 × 7,621.30
  4. Step 4: Simplify right side
    20,776.11x = 237,448,899.73
  5. Step 5: Solve for x
    x = 237,448,899.73/20,776.11
  6. Step 6: Final answer
    x = 11,428.94

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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.