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Finding the Fourth Proportional to 690.99, 1,034.10 and 427.34

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Solution

The fourth proportional to 690.99, 1,034.10 and 427.34 is: 639.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.99 : 1,034.10 = 427.34 : x
  2. Step 2: Convert to fraction form
    690.99/1,034.10 = 427.34/x
  3. Step 3: Cross multiply
    690.99x = 1,034.10 × 427.34
  4. Step 4: Simplify right side
    690.99x = 441,914.88
  5. Step 5: Solve for x
    x = 441,914.88/690.99
  6. Step 6: Final answer
    x = 639.54

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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.