Home / 15,511.90-21,406.11-8,438.50

Finding the Fourth Proportional to 15,511.90, 21,406.11 and 8,438.50

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Solution

The fourth proportional to 15,511.90, 21,406.11 and 8,438.50 is: 11,644.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,511.90 : 21,406.11 = 8,438.50 : x
  2. Step 2: Convert to fraction form
    15,511.90/21,406.11 = 8,438.50/x
  3. Step 3: Cross multiply
    15,511.90x = 21,406.11 × 8,438.50
  4. Step 4: Simplify right side
    15,511.90x = 180,635,459.24
  5. Step 5: Solve for x
    x = 180,635,459.24/15,511.90
  6. Step 6: Final answer
    x = 11,644.96

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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.