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Finding the Fourth Proportional to 18,420.40, 27,641.32 and 7,745.98

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Solution

The fourth proportional to 18,420.40, 27,641.32 and 7,745.98 is: 11,623.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.40 : 27,641.32 = 7,745.98 : x
  2. Step 2: Convert to fraction form
    18,420.40/27,641.32 = 7,745.98/x
  3. Step 3: Cross multiply
    18,420.40x = 27,641.32 × 7,745.98
  4. Step 4: Simplify right side
    18,420.40x = 214,109,111.89
  5. Step 5: Solve for x
    x = 214,109,111.89/18,420.40
  6. Step 6: Final answer
    x = 11,623.48

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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.