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Finding the Fourth Proportional to 17,280.40, 25,920.60 and 12,906.40

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Solution

The fourth proportional to 17,280.40, 25,920.60 and 12,906.40 is: 19,359.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,280.40 : 25,920.60 = 12,906.40 : x
  2. Step 2: Convert to fraction form
    17,280.40/25,920.60 = 12,906.40/x
  3. Step 3: Cross multiply
    17,280.40x = 25,920.60 × 12,906.40
  4. Step 4: Simplify right side
    17,280.40x = 334,541,631.84
  5. Step 5: Solve for x
    x = 334,541,631.84/17,280.40
  6. Step 6: Final answer
    x = 19,359.60

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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.