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Finding the Fourth Proportional to 647.67, 893.66 and 399.03

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Solution

The fourth proportional to 647.67, 893.66 and 399.03 is: 550.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.67 : 893.66 = 399.03 : x
  2. Step 2: Convert to fraction form
    647.67/893.66 = 399.03/x
  3. Step 3: Cross multiply
    647.67x = 893.66 × 399.03
  4. Step 4: Simplify right side
    647.67x = 356,595.15
  5. Step 5: Solve for x
    x = 356,595.15/647.67
  6. Step 6: Final answer
    x = 550.58

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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.