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Finding the Fourth Proportional to 968.80, 1,336.62 and 619.69

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Solution

The fourth proportional to 968.80, 1,336.62 and 619.69 is: 854.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.80 : 1,336.62 = 619.69 : x
  2. Step 2: Convert to fraction form
    968.80/1,336.62 = 619.69/x
  3. Step 3: Cross multiply
    968.80x = 1,336.62 × 619.69
  4. Step 4: Simplify right side
    968.80x = 828,290.05
  5. Step 5: Solve for x
    x = 828,290.05/968.80
  6. Step 6: Final answer
    x = 854.96

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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.