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Finding the Fourth Proportional to 647.42, 893.16 and 385.38

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Solution

The fourth proportional to 647.42, 893.16 and 385.38 is: 531.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.42 : 893.16 = 385.38 : x
  2. Step 2: Convert to fraction form
    647.42/893.16 = 385.38/x
  3. Step 3: Cross multiply
    647.42x = 893.16 × 385.38
  4. Step 4: Simplify right side
    647.42x = 344,206.00
  5. Step 5: Solve for x
    x = 344,206.00/647.42
  6. Step 6: Final answer
    x = 531.66

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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.