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Finding the Fourth Proportional to 756.93, 1,134.27 and 427.74

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Solution

The fourth proportional to 756.93, 1,134.27 and 427.74 is: 640.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.93 : 1,134.27 = 427.74 : x
  2. Step 2: Convert to fraction form
    756.93/1,134.27 = 427.74/x
  3. Step 3: Cross multiply
    756.93x = 1,134.27 × 427.74
  4. Step 4: Simplify right side
    756.93x = 485,172.65
  5. Step 5: Solve for x
    x = 485,172.65/756.93
  6. Step 6: Final answer
    x = 640.97

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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.