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Finding the Fourth Proportional to 647.82, 893.96 and 399.16

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Solution

The fourth proportional to 647.82, 893.96 and 399.16 is: 550.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.82 : 893.96 = 399.16 : x
  2. Step 2: Convert to fraction form
    647.82/893.96 = 399.16/x
  3. Step 3: Cross multiply
    647.82x = 893.96 × 399.16
  4. Step 4: Simplify right side
    647.82x = 356,833.07
  5. Step 5: Solve for x
    x = 356,833.07/647.82
  6. Step 6: Final answer
    x = 550.82

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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.