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Finding the Fourth Proportional to 2,199.40, 3,297.90 and 812.50

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Solution

The fourth proportional to 2,199.40, 3,297.90 and 812.50 is: 1,218.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,199.40 : 3,297.90 = 812.50 : x
  2. Step 2: Convert to fraction form
    2,199.40/3,297.90 = 812.50/x
  3. Step 3: Cross multiply
    2,199.40x = 3,297.90 × 812.50
  4. Step 4: Simplify right side
    2,199.40x = 2,679,543.75
  5. Step 5: Solve for x
    x = 2,679,543.75/2,199.40
  6. Step 6: Final answer
    x = 1,218.31

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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.