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Finding the Fourth Proportional to 1,172.19, 1,756.64 and 911

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Solution

The fourth proportional to 1,172.19, 1,756.64 and 911 is: 1,365.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.19 : 1,756.64 = 911 : x
  2. Step 2: Convert to fraction form
    1,172.19/1,756.64 = 911/x
  3. Step 3: Cross multiply
    1,172.19x = 1,756.64 × 911
  4. Step 4: Simplify right side
    1,172.19x = 1,600,299.04
  5. Step 5: Solve for x
    x = 1,600,299.04/1,172.19
  6. Step 6: Final answer
    x = 1,365.22

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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.