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Finding the Fourth Proportional to 9,009.60, 12,474.72 and 8,318.40

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Solution

The fourth proportional to 9,009.60, 12,474.72 and 8,318.40 is: 11,517.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,009.60 : 12,474.72 = 8,318.40 : x
  2. Step 2: Convert to fraction form
    9,009.60/12,474.72 = 8,318.40/x
  3. Step 3: Cross multiply
    9,009.60x = 12,474.72 × 8,318.40
  4. Step 4: Simplify right side
    9,009.60x = 103,769,710.85
  5. Step 5: Solve for x
    x = 103,769,710.85/9,009.60
  6. Step 6: Final answer
    x = 11,517.68

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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.