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Finding the Fourth Proportional to 963.37, 1,328.75 and 931.22

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Solution

The fourth proportional to 963.37, 1,328.75 and 931.22 is: 1,284.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.37 : 1,328.75 = 931.22 : x
  2. Step 2: Convert to fraction form
    963.37/1,328.75 = 931.22/x
  3. Step 3: Cross multiply
    963.37x = 1,328.75 × 931.22
  4. Step 4: Simplify right side
    963.37x = 1,237,364.73
  5. Step 5: Solve for x
    x = 1,237,364.73/963.37
  6. Step 6: Final answer
    x = 1,284.41

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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.