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Finding the Fourth Proportional to 3,121.80, 4,683.36 and 930.70

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Solution

The fourth proportional to 3,121.80, 4,683.36 and 930.70 is: 1,396.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.80 : 4,683.36 = 930.70 : x
  2. Step 2: Convert to fraction form
    3,121.80/4,683.36 = 930.70/x
  3. Step 3: Cross multiply
    3,121.80x = 4,683.36 × 930.70
  4. Step 4: Simplify right side
    3,121.80x = 4,358,803.15
  5. Step 5: Solve for x
    x = 4,358,803.15/3,121.80
  6. Step 6: Final answer
    x = 1,396.25

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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.