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Finding the Fourth Proportional to 1,131.84, 1,697.36 and 612.23

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Solution

The fourth proportional to 1,131.84, 1,697.36 and 612.23 is: 918.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.84 : 1,697.36 = 612.23 : x
  2. Step 2: Convert to fraction form
    1,131.84/1,697.36 = 612.23/x
  3. Step 3: Cross multiply
    1,131.84x = 1,697.36 × 612.23
  4. Step 4: Simplify right side
    1,131.84x = 1,039,163.16
  5. Step 5: Solve for x
    x = 1,039,163.16/1,131.84
  6. Step 6: Final answer
    x = 918.12

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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.