Home / 9,378.80-12,942.84-5,187.20

Finding the Fourth Proportional to 9,378.80, 12,942.84 and 5,187.20

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Solution

The fourth proportional to 9,378.80, 12,942.84 and 5,187.20 is: 7,158.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,378.80 : 12,942.84 = 5,187.20 : x
  2. Step 2: Convert to fraction form
    9,378.80/12,942.84 = 5,187.20/x
  3. Step 3: Cross multiply
    9,378.80x = 12,942.84 × 5,187.20
  4. Step 4: Simplify right side
    9,378.80x = 67,137,099.65
  5. Step 5: Solve for x
    x = 67,137,099.65/9,378.80
  6. Step 6: Final answer
    x = 7,158.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.