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Finding the Fourth Proportional to 1,442.70, 1,989.60 and 963.31

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Solution

The fourth proportional to 1,442.70, 1,989.60 and 963.31 is: 1,328.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.70 : 1,989.60 = 963.31 : x
  2. Step 2: Convert to fraction form
    1,442.70/1,989.60 = 963.31/x
  3. Step 3: Cross multiply
    1,442.70x = 1,989.60 × 963.31
  4. Step 4: Simplify right side
    1,442.70x = 1,916,601.58
  5. Step 5: Solve for x
    x = 1,916,601.58/1,442.70
  6. Step 6: Final answer
    x = 1,328.48

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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.