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Finding the Fourth Proportional to 647.54, 893.47 and 385.51

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Solution

The fourth proportional to 647.54, 893.47 and 385.51 is: 531.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.54 : 893.47 = 385.51 : x
  2. Step 2: Convert to fraction form
    647.54/893.47 = 385.51/x
  3. Step 3: Cross multiply
    647.54x = 893.47 × 385.51
  4. Step 4: Simplify right side
    647.54x = 344,441.62
  5. Step 5: Solve for x
    x = 344,441.62/647.54
  6. Step 6: Final answer
    x = 531.92

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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.