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Finding the Fourth Proportional to 3,121.47, 4,683.39 and 930.21

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Solution

The fourth proportional to 3,121.47, 4,683.39 and 930.21 is: 1,395.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.47 : 4,683.39 = 930.21 : x
  2. Step 2: Convert to fraction form
    3,121.47/4,683.39 = 930.21/x
  3. Step 3: Cross multiply
    3,121.47x = 4,683.39 × 930.21
  4. Step 4: Simplify right side
    3,121.47x = 4,356,536.21
  5. Step 5: Solve for x
    x = 4,356,536.21/3,121.47
  6. Step 6: Final answer
    x = 1,395.67

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Double scale
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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.