Home / 9,378.90-12,940.74-5,399.28

Finding the Fourth Proportional to 9,378.90, 12,940.74 and 5,399.28

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Solution

The fourth proportional to 9,378.90, 12,940.74 and 5,399.28 is: 7,449.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,378.90 : 12,940.74 = 5,399.28 : x
  2. Step 2: Convert to fraction form
    9,378.90/12,940.74 = 5,399.28/x
  3. Step 3: Cross multiply
    9,378.90x = 12,940.74 × 5,399.28
  4. Step 4: Simplify right side
    9,378.90x = 69,870,678.67
  5. Step 5: Solve for x
    x = 69,870,678.67/9,378.90
  6. Step 6: Final answer
    x = 7,449.77

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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.