Home / 7,112.80-9,815.36-3,968.96

Finding the Fourth Proportional to 7,112.80, 9,815.36 and 3,968.96

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Solution

The fourth proportional to 7,112.80, 9,815.36 and 3,968.96 is: 5,477.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,112.80 : 9,815.36 = 3,968.96 : x
  2. Step 2: Convert to fraction form
    7,112.80/9,815.36 = 3,968.96/x
  3. Step 3: Cross multiply
    7,112.80x = 9,815.36 × 3,968.96
  4. Step 4: Simplify right side
    7,112.80x = 38,956,771.23
  5. Step 5: Solve for x
    x = 38,956,771.23/7,112.80
  6. Step 6: Final answer
    x = 5,477.00

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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.