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Finding the Fourth Proportional to 975.99, 1,346.49 and 644.58

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Solution

The fourth proportional to 975.99, 1,346.49 and 644.58 is: 889.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.99 : 1,346.49 = 644.58 : x
  2. Step 2: Convert to fraction form
    975.99/1,346.49 = 644.58/x
  3. Step 3: Cross multiply
    975.99x = 1,346.49 × 644.58
  4. Step 4: Simplify right side
    975.99x = 867,920.52
  5. Step 5: Solve for x
    x = 867,920.52/975.99
  6. Step 6: Final answer
    x = 889.27

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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.