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Finding the Fourth Proportional to 2,420.62, 3,630.93 and 1,990.60

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Solution

The fourth proportional to 2,420.62, 3,630.93 and 1,990.60 is: 2,985.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,420.62 : 3,630.93 = 1,990.60 : x
  2. Step 2: Convert to fraction form
    2,420.62/3,630.93 = 1,990.60/x
  3. Step 3: Cross multiply
    2,420.62x = 3,630.93 × 1,990.60
  4. Step 4: Simplify right side
    2,420.62x = 7,227,729.26
  5. Step 5: Solve for x
    x = 7,227,729.26/2,420.62
  6. Step 6: Final answer
    x = 2,985.90

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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.