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Finding the Fourth Proportional to 969.20, 1,336.68 and 619.76

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Solution

The fourth proportional to 969.20, 1,336.68 and 619.76 is: 854.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.20 : 1,336.68 = 619.76 : x
  2. Step 2: Convert to fraction form
    969.20/1,336.68 = 619.76/x
  3. Step 3: Cross multiply
    969.20x = 1,336.68 × 619.76
  4. Step 4: Simplify right side
    969.20x = 828,420.80
  5. Step 5: Solve for x
    x = 828,420.80/969.20
  6. Step 6: Final answer
    x = 854.75

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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.