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Finding the Fourth Proportional to 933.36, 1,286.96 and 618.88

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Solution

The fourth proportional to 933.36, 1,286.96 and 618.88 is: 853.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.36 : 1,286.96 = 618.88 : x
  2. Step 2: Convert to fraction form
    933.36/1,286.96 = 618.88/x
  3. Step 3: Cross multiply
    933.36x = 1,286.96 × 618.88
  4. Step 4: Simplify right side
    933.36x = 796,473.80
  5. Step 5: Solve for x
    x = 796,473.80/933.36
  6. Step 6: Final answer
    x = 853.34

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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.