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Finding the Fourth Proportional to 6,879.20, 10,312.80 and 4,680.80

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Solution

The fourth proportional to 6,879.20, 10,312.80 and 4,680.80 is: 7,017.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,879.20 : 10,312.80 = 4,680.80 : x
  2. Step 2: Convert to fraction form
    6,879.20/10,312.80 = 4,680.80/x
  3. Step 3: Cross multiply
    6,879.20x = 10,312.80 × 4,680.80
  4. Step 4: Simplify right side
    6,879.20x = 48,272,154.24
  5. Step 5: Solve for x
    x = 48,272,154.24/6,879.20
  6. Step 6: Final answer
    x = 7,017.12

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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.