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Finding the Fourth Proportional to 2,150.40, 3,225.60 and 690.60

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Solution

The fourth proportional to 2,150.40, 3,225.60 and 690.60 is: 1,035.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,150.40 : 3,225.60 = 690.60 : x
  2. Step 2: Convert to fraction form
    2,150.40/3,225.60 = 690.60/x
  3. Step 3: Cross multiply
    2,150.40x = 3,225.60 × 690.60
  4. Step 4: Simplify right side
    2,150.40x = 2,227,599.36
  5. Step 5: Solve for x
    x = 2,227,599.36/2,150.40
  6. Step 6: Final answer
    x = 1,035.90

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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.