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Finding the Fourth Proportional to 6,920.80, 10,366.80 and 5,768.80

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Solution

The fourth proportional to 6,920.80, 10,366.80 and 5,768.80 is: 8,641.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,920.80 : 10,366.80 = 5,768.80 : x
  2. Step 2: Convert to fraction form
    6,920.80/10,366.80 = 5,768.80/x
  3. Step 3: Cross multiply
    6,920.80x = 10,366.80 × 5,768.80
  4. Step 4: Simplify right side
    6,920.80x = 59,803,995.84
  5. Step 5: Solve for x
    x = 59,803,995.84/6,920.80
  6. Step 6: Final answer
    x = 8,641.20

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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.