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Finding the Fourth Proportional to 1,172.12, 1,617.42 and 699.98

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Solution

The fourth proportional to 1,172.12, 1,617.42 and 699.98 is: 965.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.12 : 1,617.42 = 699.98 : x
  2. Step 2: Convert to fraction form
    1,172.12/1,617.42 = 699.98/x
  3. Step 3: Cross multiply
    1,172.12x = 1,617.42 × 699.98
  4. Step 4: Simplify right side
    1,172.12x = 1,132,161.65
  5. Step 5: Solve for x
    x = 1,132,161.65/1,172.12
  6. Step 6: Final answer
    x = 965.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.