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Finding the Fourth Proportional to 739.14, 1,019.45 and 490.38

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Solution

The fourth proportional to 739.14, 1,019.45 and 490.38 is: 676.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.14 : 1,019.45 = 490.38 : x
  2. Step 2: Convert to fraction form
    739.14/1,019.45 = 490.38/x
  3. Step 3: Cross multiply
    739.14x = 1,019.45 × 490.38
  4. Step 4: Simplify right side
    739.14x = 499,915.44
  5. Step 5: Solve for x
    x = 499,915.44/739.14
  6. Step 6: Final answer
    x = 676.35

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.