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Finding the Fourth Proportional to 3,121.80, 4,682.10 and 930.60

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Solution

The fourth proportional to 3,121.80, 4,682.10 and 930.60 is: 1,395.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.80 : 4,682.10 = 930.60 : x
  2. Step 2: Convert to fraction form
    3,121.80/4,682.10 = 930.60/x
  3. Step 3: Cross multiply
    3,121.80x = 4,682.10 × 930.60
  4. Step 4: Simplify right side
    3,121.80x = 4,357,162.26
  5. Step 5: Solve for x
    x = 4,357,162.26/3,121.80
  6. Step 6: Final answer
    x = 1,395.72

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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.