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Finding the Fourth Proportional to 969.45, 1,335.69 and 637.32

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Solution

The fourth proportional to 969.45, 1,335.69 and 637.32 is: 878.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.45 : 1,335.69 = 637.32 : x
  2. Step 2: Convert to fraction form
    969.45/1,335.69 = 637.32/x
  3. Step 3: Cross multiply
    969.45x = 1,335.69 × 637.32
  4. Step 4: Simplify right side
    969.45x = 851,261.95
  5. Step 5: Solve for x
    x = 851,261.95/969.45
  6. Step 6: Final answer
    x = 878.09

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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.