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Finding the Fourth Proportional to 647.57, 893.93 and 490.23

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Solution

The fourth proportional to 647.57, 893.93 and 490.23 is: 676.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.57 : 893.93 = 490.23 : x
  2. Step 2: Convert to fraction form
    647.57/893.93 = 490.23/x
  3. Step 3: Cross multiply
    647.57x = 893.93 × 490.23
  4. Step 4: Simplify right side
    647.57x = 438,231.30
  5. Step 5: Solve for x
    x = 438,231.30/647.57
  6. Step 6: Final answer
    x = 676.73

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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.