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Finding the Fourth Proportional to 647.66, 893.22 and 437.78

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Solution

The fourth proportional to 647.66, 893.22 and 437.78 is: 603.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.66 : 893.22 = 437.78 : x
  2. Step 2: Convert to fraction form
    647.66/893.22 = 437.78/x
  3. Step 3: Cross multiply
    647.66x = 893.22 × 437.78
  4. Step 4: Simplify right side
    647.66x = 391,033.85
  5. Step 5: Solve for x
    x = 391,033.85/647.66
  6. Step 6: Final answer
    x = 603.76

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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.