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Finding the Fourth Proportional to 8,928.96, 12,318.08 and 5,390.12

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Solution

The fourth proportional to 8,928.96, 12,318.08 and 5,390.12 is: 7,436.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,928.96 : 12,318.08 = 5,390.12 : x
  2. Step 2: Convert to fraction form
    8,928.96/12,318.08 = 5,390.12/x
  3. Step 3: Cross multiply
    8,928.96x = 12,318.08 × 5,390.12
  4. Step 4: Simplify right side
    8,928.96x = 66,395,929.37
  5. Step 5: Solve for x
    x = 66,395,929.37/8,928.96
  6. Step 6: Final answer
    x = 7,436.02

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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.