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Finding the Fourth Proportional to 969.24, 1,338.10 and 638.22

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Solution

The fourth proportional to 969.24, 1,338.10 and 638.22 is: 881.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.24 : 1,338.10 = 638.22 : x
  2. Step 2: Convert to fraction form
    969.24/1,338.10 = 638.22/x
  3. Step 3: Cross multiply
    969.24x = 1,338.10 × 638.22
  4. Step 4: Simplify right side
    969.24x = 854,002.18
  5. Step 5: Solve for x
    x = 854,002.18/969.24
  6. Step 6: Final answer
    x = 881.10

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1.5x scale

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.