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Finding the Fourth Proportional to 13,203.72, 18,221.64 and 7,235.64

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Solution

The fourth proportional to 13,203.72, 18,221.64 and 7,235.64 is: 9,985.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,203.72 : 18,221.64 = 7,235.64 : x
  2. Step 2: Convert to fraction form
    13,203.72/18,221.64 = 7,235.64/x
  3. Step 3: Cross multiply
    13,203.72x = 18,221.64 × 7,235.64
  4. Step 4: Simplify right side
    13,203.72x = 131,845,227.25
  5. Step 5: Solve for x
    x = 131,845,227.25/13,203.72
  6. Step 6: Final answer
    x = 9,985.46

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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.