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Finding the Fourth Proportional to 3,621, 5,431.50 and 1,312.50

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Solution

The fourth proportional to 3,621, 5,431.50 and 1,312.50 is: 1,968.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,621 : 5,431.50 = 1,312.50 : x
  2. Step 2: Convert to fraction form
    3,621/5,431.50 = 1,312.50/x
  3. Step 3: Cross multiply
    3,621x = 5,431.50 × 1,312.50
  4. Step 4: Simplify right side
    3,621x = 7,128,843.75
  5. Step 5: Solve for x
    x = 7,128,843.75/3,621
  6. Step 6: Final answer
    x = 1,968.75

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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.