Home / 15,511.92-21,405.83-8,438.37

Finding the Fourth Proportional to 15,511.92, 21,405.83 and 8,438.37

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Solution

The fourth proportional to 15,511.92, 21,405.83 and 8,438.37 is: 11,644.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,511.92 : 21,405.83 = 8,438.37 : x
  2. Step 2: Convert to fraction form
    15,511.92/21,405.83 = 8,438.37/x
  3. Step 3: Cross multiply
    15,511.92x = 21,405.83 × 8,438.37
  4. Step 4: Simplify right side
    15,511.92x = 180,630,271.51
  5. Step 5: Solve for x
    x = 180,630,271.51/15,511.92
  6. Step 6: Final answer
    x = 11,644.61

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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.