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Finding the Fourth Proportional to 12,939.20, 19,408.80 and 11,470.40

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Solution

The fourth proportional to 12,939.20, 19,408.80 and 11,470.40 is: 17,205.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.20 : 19,408.80 = 11,470.40 : x
  2. Step 2: Convert to fraction form
    12,939.20/19,408.80 = 11,470.40/x
  3. Step 3: Cross multiply
    12,939.20x = 19,408.80 × 11,470.40
  4. Step 4: Simplify right side
    12,939.20x = 222,626,699.52
  5. Step 5: Solve for x
    x = 222,626,699.52/12,939.20
  6. Step 6: Final answer
    x = 17,205.60

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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.