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Finding the Fourth Proportional to 626.70, 939.54 and 407.54

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Solution

The fourth proportional to 626.70, 939.54 and 407.54 is: 610.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.70 : 939.54 = 407.54 : x
  2. Step 2: Convert to fraction form
    626.70/939.54 = 407.54/x
  3. Step 3: Cross multiply
    626.70x = 939.54 × 407.54
  4. Step 4: Simplify right side
    626.70x = 382,900.13
  5. Step 5: Solve for x
    x = 382,900.13/626.70
  6. Step 6: Final answer
    x = 610.98

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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.