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Finding the Fourth Proportional to 918.43, 1,375.91 and 711.99

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Solution

The fourth proportional to 918.43, 1,375.91 and 711.99 is: 1,066.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.43 : 1,375.91 = 711.99 : x
  2. Step 2: Convert to fraction form
    918.43/1,375.91 = 711.99/x
  3. Step 3: Cross multiply
    918.43x = 1,375.91 × 711.99
  4. Step 4: Simplify right side
    918.43x = 979,632.44
  5. Step 5: Solve for x
    x = 979,632.44/918.43
  6. Step 6: Final answer
    x = 1,066.64

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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.