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Finding the Fourth Proportional to 975.75, 1,346.54 and 644.73

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Solution

The fourth proportional to 975.75, 1,346.54 and 644.73 is: 889.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.75 : 1,346.54 = 644.73 : x
  2. Step 2: Convert to fraction form
    975.75/1,346.54 = 644.73/x
  3. Step 3: Cross multiply
    975.75x = 1,346.54 × 644.73
  4. Step 4: Simplify right side
    975.75x = 868,151.51
  5. Step 5: Solve for x
    x = 868,151.51/975.75
  6. Step 6: Final answer
    x = 889.73

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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.