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Finding the Fourth Proportional to 1,451.22, 2,172.96 and 989.90

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Solution

The fourth proportional to 1,451.22, 2,172.96 and 989.90 is: 1,482.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,451.22 : 2,172.96 = 989.90 : x
  2. Step 2: Convert to fraction form
    1,451.22/2,172.96 = 989.90/x
  3. Step 3: Cross multiply
    1,451.22x = 2,172.96 × 989.90
  4. Step 4: Simplify right side
    1,451.22x = 2,151,013.10
  5. Step 5: Solve for x
    x = 2,151,013.10/1,451.22
  6. Step 6: Final answer
    x = 1,482.21

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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.