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Finding the Fourth Proportional to 3,120.53, 4,680.47 and 930.65

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Solution

The fourth proportional to 3,120.53, 4,680.47 and 930.65 is: 1,395.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.53 : 4,680.47 = 930.65 : x
  2. Step 2: Convert to fraction form
    3,120.53/4,680.47 = 930.65/x
  3. Step 3: Cross multiply
    3,120.53x = 4,680.47 × 930.65
  4. Step 4: Simplify right side
    3,120.53x = 4,355,858.33
  5. Step 5: Solve for x
    x = 4,355,858.33/3,120.53
  6. Step 6: Final answer
    x = 1,395.87

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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.