Home / 7,112.74-9,815.34-4,128.10

Finding the Fourth Proportional to 7,112.74, 9,815.34 and 4,128.10

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Solution

The fourth proportional to 7,112.74, 9,815.34 and 4,128.10 is: 5,696.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,112.74 : 9,815.34 = 4,128.10 : x
  2. Step 2: Convert to fraction form
    7,112.74/9,815.34 = 4,128.10/x
  3. Step 3: Cross multiply
    7,112.74x = 9,815.34 × 4,128.10
  4. Step 4: Simplify right side
    7,112.74x = 40,518,705.05
  5. Step 5: Solve for x
    x = 40,518,705.05/7,112.74
  6. Step 6: Final answer
    x = 5,696.64

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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.