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Finding the Fourth Proportional to 13,203.80, 18,221.18 and 7,235.84

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Solution

The fourth proportional to 13,203.80, 18,221.18 and 7,235.84 is: 9,985.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,203.80 : 18,221.18 = 7,235.84 : x
  2. Step 2: Convert to fraction form
    13,203.80/18,221.18 = 7,235.84/x
  3. Step 3: Cross multiply
    13,203.80x = 18,221.18 × 7,235.84
  4. Step 4: Simplify right side
    13,203.80x = 131,845,543.09
  5. Step 5: Solve for x
    x = 131,845,543.09/13,203.80
  6. Step 6: Final answer
    x = 9,985.42

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Double scale
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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.