Home / 15,511.85-21,406.37-8,438.25

Finding the Fourth Proportional to 15,511.85, 21,406.37 and 8,438.25

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Solution

The fourth proportional to 15,511.85, 21,406.37 and 8,438.25 is: 11,644.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,511.85 : 21,406.37 = 8,438.25 : x
  2. Step 2: Convert to fraction form
    15,511.85/21,406.37 = 8,438.25/x
  3. Step 3: Cross multiply
    15,511.85x = 21,406.37 × 8,438.25
  4. Step 4: Simplify right side
    15,511.85x = 180,632,259.46
  5. Step 5: Solve for x
    x = 180,632,259.46/15,511.85
  6. Step 6: Final answer
    x = 11,644.80

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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.