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Finding the Fourth Proportional to 1,038.21, 1,558.19 and 490.78

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Solution

The fourth proportional to 1,038.21, 1,558.19 and 490.78 is: 736.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.21 : 1,558.19 = 490.78 : x
  2. Step 2: Convert to fraction form
    1,038.21/1,558.19 = 490.78/x
  3. Step 3: Cross multiply
    1,038.21x = 1,558.19 × 490.78
  4. Step 4: Simplify right side
    1,038.21x = 764,728.49
  5. Step 5: Solve for x
    x = 764,728.49/1,038.21
  6. Step 6: Final answer
    x = 736.58

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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.