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Finding the Fourth Proportional to 13,605.86, 20,389.79 and 7,352.39

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Solution

The fourth proportional to 13,605.86, 20,389.79 and 7,352.39 is: 11,018.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,605.86 : 20,389.79 = 7,352.39 : x
  2. Step 2: Convert to fraction form
    13,605.86/20,389.79 = 7,352.39/x
  3. Step 3: Cross multiply
    13,605.86x = 20,389.79 × 7,352.39
  4. Step 4: Simplify right side
    13,605.86x = 149,913,757.45
  5. Step 5: Solve for x
    x = 149,913,757.45/13,605.86
  6. Step 6: Final answer
    x = 11,018.32

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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.