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Finding the Fourth Proportional to 9,879.20, 14,818.80 and 5,271.20

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Solution

The fourth proportional to 9,879.20, 14,818.80 and 5,271.20 is: 7,906.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,879.20 : 14,818.80 = 5,271.20 : x
  2. Step 2: Convert to fraction form
    9,879.20/14,818.80 = 5,271.20/x
  3. Step 3: Cross multiply
    9,879.20x = 14,818.80 × 5,271.20
  4. Step 4: Simplify right side
    9,879.20x = 78,112,858.56
  5. Step 5: Solve for x
    x = 78,112,858.56/9,879.20
  6. Step 6: Final answer
    x = 7,906.80

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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.