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Finding the Fourth Proportional to 751.66, 1,127.49 and 427.26

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Solution

The fourth proportional to 751.66, 1,127.49 and 427.26 is: 640.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.66 : 1,127.49 = 427.26 : x
  2. Step 2: Convert to fraction form
    751.66/1,127.49 = 427.26/x
  3. Step 3: Cross multiply
    751.66x = 1,127.49 × 427.26
  4. Step 4: Simplify right side
    751.66x = 481,731.38
  5. Step 5: Solve for x
    x = 481,731.38/751.66
  6. Step 6: Final answer
    x = 640.89

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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.