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Finding the Fourth Proportional to 12,645.72, 18,970.74 and 3,879.72

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Solution

The fourth proportional to 12,645.72, 18,970.74 and 3,879.72 is: 5,820.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,645.72 : 18,970.74 = 3,879.72 : x
  2. Step 2: Convert to fraction form
    12,645.72/18,970.74 = 3,879.72/x
  3. Step 3: Cross multiply
    12,645.72x = 18,970.74 × 3,879.72
  4. Step 4: Simplify right side
    12,645.72x = 73,601,159.39
  5. Step 5: Solve for x
    x = 73,601,159.39/12,645.72
  6. Step 6: Final answer
    x = 5,820.24

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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.