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Finding the Fourth Proportional to 13,355.28, 18,424.08 and 8,641.08

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Solution

The fourth proportional to 13,355.28, 18,424.08 and 8,641.08 is: 11,920.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,355.28 : 18,424.08 = 8,641.08 : x
  2. Step 2: Convert to fraction form
    13,355.28/18,424.08 = 8,641.08/x
  3. Step 3: Cross multiply
    13,355.28x = 18,424.08 × 8,641.08
  4. Step 4: Simplify right side
    13,355.28x = 159,203,949.21
  5. Step 5: Solve for x
    x = 159,203,949.21/13,355.28
  6. Step 6: Final answer
    x = 11,920.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.