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Finding the Fourth Proportional to 12,645.77, 18,969.14 and 4,747.51

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Solution

The fourth proportional to 12,645.77, 18,969.14 and 4,747.51 is: 7,121.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,645.77 : 18,969.14 = 4,747.51 : x
  2. Step 2: Convert to fraction form
    12,645.77/18,969.14 = 4,747.51/x
  3. Step 3: Cross multiply
    12,645.77x = 18,969.14 × 4,747.51
  4. Step 4: Simplify right side
    12,645.77x = 90,056,190.72
  5. Step 5: Solve for x
    x = 90,056,190.72/12,645.77
  6. Step 6: Final answer
    x = 7,121.45

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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.