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Finding the Fourth Proportional to 969.96, 1,338.18 and 638.58

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Solution

The fourth proportional to 969.96, 1,338.18 and 638.58 is: 881.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.96 : 1,338.18 = 638.58 : x
  2. Step 2: Convert to fraction form
    969.96/1,338.18 = 638.58/x
  3. Step 3: Cross multiply
    969.96x = 1,338.18 × 638.58
  4. Step 4: Simplify right side
    969.96x = 854,534.98
  5. Step 5: Solve for x
    x = 854,534.98/969.96
  6. Step 6: Final answer
    x = 881.00

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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.