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Finding the Fourth Proportional to 4,879.40, 7,319.10 and 1,959.80

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Solution

The fourth proportional to 4,879.40, 7,319.10 and 1,959.80 is: 2,939.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,879.40 : 7,319.10 = 1,959.80 : x
  2. Step 2: Convert to fraction form
    4,879.40/7,319.10 = 1,959.80/x
  3. Step 3: Cross multiply
    4,879.40x = 7,319.10 × 1,959.80
  4. Step 4: Simplify right side
    4,879.40x = 14,343,972.18
  5. Step 5: Solve for x
    x = 14,343,972.18/4,879.40
  6. Step 6: Final answer
    x = 2,939.70

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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.