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Finding the Fourth Proportional to 9,928.40, 14,921.40 and 8,661.20

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Solution

The fourth proportional to 9,928.40, 14,921.40 and 8,661.20 is: 13,016.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,928.40 : 14,921.40 = 8,661.20 : x
  2. Step 2: Convert to fraction form
    9,928.40/14,921.40 = 8,661.20/x
  3. Step 3: Cross multiply
    9,928.40x = 14,921.40 × 8,661.20
  4. Step 4: Simplify right side
    9,928.40x = 129,237,229.68
  5. Step 5: Solve for x
    x = 129,237,229.68/9,928.40
  6. Step 6: Final answer
    x = 13,016.92

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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.