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Finding the Fourth Proportional to 647.78, 971.64 and 185.56

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Solution

The fourth proportional to 647.78, 971.64 and 185.56 is: 278.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.78 : 971.64 = 185.56 : x
  2. Step 2: Convert to fraction form
    647.78/971.64 = 185.56/x
  3. Step 3: Cross multiply
    647.78x = 971.64 × 185.56
  4. Step 4: Simplify right side
    647.78x = 180,295.09
  5. Step 5: Solve for x
    x = 180,295.09/647.78
  6. Step 6: Final answer
    x = 278.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.