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Finding the Fourth Proportional to 647.75, 969.78 and 550.13

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Solution

The fourth proportional to 647.75, 969.78 and 550.13 is: 823.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.75 : 969.78 = 550.13 : x
  2. Step 2: Convert to fraction form
    647.75/969.78 = 550.13/x
  3. Step 3: Cross multiply
    647.75x = 969.78 × 550.13
  4. Step 4: Simplify right side
    647.75x = 533,505.07
  5. Step 5: Solve for x
    x = 533,505.07/647.75
  6. Step 6: Final answer
    x = 823.63

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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.