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Finding the Fourth Proportional to 1,172.14, 1,757.35 and 709.81

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Solution

The fourth proportional to 1,172.14, 1,757.35 and 709.81 is: 1,064.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.14 : 1,757.35 = 709.81 : x
  2. Step 2: Convert to fraction form
    1,172.14/1,757.35 = 709.81/x
  3. Step 3: Cross multiply
    1,172.14x = 1,757.35 × 709.81
  4. Step 4: Simplify right side
    1,172.14x = 1,247,381.05
  5. Step 5: Solve for x
    x = 1,247,381.05/1,172.14
  6. Step 6: Final answer
    x = 1,064.19

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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.