Home / 13,188.98-18,200.85-7,221.21

Finding the Fourth Proportional to 13,188.98, 18,200.85 and 7,221.21

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Solution

The fourth proportional to 13,188.98, 18,200.85 and 7,221.21 is: 9,965.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,188.98 : 18,200.85 = 7,221.21 : x
  2. Step 2: Convert to fraction form
    13,188.98/18,200.85 = 7,221.21/x
  3. Step 3: Cross multiply
    13,188.98x = 18,200.85 × 7,221.21
  4. Step 4: Simplify right side
    13,188.98x = 131,432,112.22
  5. Step 5: Solve for x
    x = 131,432,112.22/13,188.98
  6. Step 6: Final answer
    x = 9,965.30

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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.