Home / 15,511.41-21,406.20-8,438.31

Finding the Fourth Proportional to 15,511.41, 21,406.20 and 8,438.31

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Solution

The fourth proportional to 15,511.41, 21,406.20 and 8,438.31 is: 11,645.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,511.41 : 21,406.20 = 8,438.31 : x
  2. Step 2: Convert to fraction form
    15,511.41/21,406.20 = 8,438.31/x
  3. Step 3: Cross multiply
    15,511.41x = 21,406.20 × 8,438.31
  4. Step 4: Simplify right side
    15,511.41x = 180,632,151.52
  5. Step 5: Solve for x
    x = 180,632,151.52/15,511.41
  6. Step 6: Final answer
    x = 11,645.11

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1.5x scale

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.