Home / 15,493.96-21,380.78-8,420.34

Finding the Fourth Proportional to 15,493.96, 21,380.78 and 8,420.34

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Solution

The fourth proportional to 15,493.96, 21,380.78 and 8,420.34 is: 11,619.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,493.96 : 21,380.78 = 8,420.34 : x
  2. Step 2: Convert to fraction form
    15,493.96/21,380.78 = 8,420.34/x
  3. Step 3: Cross multiply
    15,493.96x = 21,380.78 × 8,420.34
  4. Step 4: Simplify right side
    15,493.96x = 180,033,437.07
  5. Step 5: Solve for x
    x = 180,033,437.07/15,493.96
  6. Step 6: Final answer
    x = 11,619.59

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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.