Home / 15,511.89-21,406.30-8,438.34

Finding the Fourth Proportional to 15,511.89, 21,406.30 and 8,438.34

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Solution

The fourth proportional to 15,511.89, 21,406.30 and 8,438.34 is: 11,644.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,511.89 : 21,406.30 = 8,438.34 : x
  2. Step 2: Convert to fraction form
    15,511.89/21,406.30 = 8,438.34/x
  3. Step 3: Cross multiply
    15,511.89x = 21,406.30 × 8,438.34
  4. Step 4: Simplify right side
    15,511.89x = 180,633,637.54
  5. Step 5: Solve for x
    x = 180,633,637.54/15,511.89
  6. Step 6: Final answer
    x = 11,644.85

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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.