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Finding the Fourth Proportional to 738.46, 1,019.60 and 490.30

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Solution

The fourth proportional to 738.46, 1,019.60 and 490.30 is: 676.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.46 : 1,019.60 = 490.30 : x
  2. Step 2: Convert to fraction form
    738.46/1,019.60 = 490.30/x
  3. Step 3: Cross multiply
    738.46x = 1,019.60 × 490.30
  4. Step 4: Simplify right side
    738.46x = 499,902.33
  5. Step 5: Solve for x
    x = 499,902.33/738.46
  6. Step 6: Final answer
    x = 676.96

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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.