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Finding the Fourth Proportional to 2,965.21, 4,448.42 and 990.60

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Solution

The fourth proportional to 2,965.21, 4,448.42 and 990.60 is: 1,486.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,965.21 : 4,448.42 = 990.60 : x
  2. Step 2: Convert to fraction form
    2,965.21/4,448.42 = 990.60/x
  3. Step 3: Cross multiply
    2,965.21x = 4,448.42 × 990.60
  4. Step 4: Simplify right side
    2,965.21x = 4,406,624.47
  5. Step 5: Solve for x
    x = 4,406,624.47/2,965.21
  6. Step 6: Final answer
    x = 1,486.11

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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.