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Finding the Fourth Proportional to 647, 970.50 and 191

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Solution

The fourth proportional to 647, 970.50 and 191 is: 286.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    647 : 970.50 = 191 : x
  2. Step 2: Convert to fraction form
    647/970.50 = 191/x
  3. Step 3: Cross multiply
    647x = 970.50 × 191
  4. Step 4: Simplify right side
    647x = 185,365.50
  5. Step 5: Solve for x
    x = 185,365.50/647
  6. Step 6: Final answer
    x = 286.50

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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.