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Finding the Fourth Proportional to 18,761.25, 28,142.16 and 4,910.25

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Solution

The fourth proportional to 18,761.25, 28,142.16 and 4,910.25 is: 7,365.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.25 : 28,142.16 = 4,910.25 : x
  2. Step 2: Convert to fraction form
    18,761.25/28,142.16 = 4,910.25/x
  3. Step 3: Cross multiply
    18,761.25x = 28,142.16 × 4,910.25
  4. Step 4: Simplify right side
    18,761.25x = 138,185,041.14
  5. Step 5: Solve for x
    x = 138,185,041.14/18,761.25
  6. Step 6: Final answer
    x = 7,365.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.