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Finding the Fourth Proportional to 13,603.30, 18,776.64 and 7,939.60

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Solution

The fourth proportional to 13,603.30, 18,776.64 and 7,939.60 is: 10,959.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,603.30 : 18,776.64 = 7,939.60 : x
  2. Step 2: Convert to fraction form
    13,603.30/18,776.64 = 7,939.60/x
  3. Step 3: Cross multiply
    13,603.30x = 18,776.64 × 7,939.60
  4. Step 4: Simplify right side
    13,603.30x = 149,079,010.94
  5. Step 5: Solve for x
    x = 149,079,010.94/13,603.30
  6. Step 6: Final answer
    x = 10,959.03

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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.