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Finding the Fourth Proportional to 975.85, 1,346.83 and 644.09

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Solution

The fourth proportional to 975.85, 1,346.83 and 644.09 is: 888.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.85 : 1,346.83 = 644.09 : x
  2. Step 2: Convert to fraction form
    975.85/1,346.83 = 644.09/x
  3. Step 3: Cross multiply
    975.85x = 1,346.83 × 644.09
  4. Step 4: Simplify right side
    975.85x = 867,471.39
  5. Step 5: Solve for x
    x = 867,471.39/975.85
  6. Step 6: Final answer
    x = 888.94

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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.