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Finding the Fourth Proportional to 857.69, 1,286.08 and 533.28

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Solution

The fourth proportional to 857.69, 1,286.08 and 533.28 is: 799.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.69 : 1,286.08 = 533.28 : x
  2. Step 2: Convert to fraction form
    857.69/1,286.08 = 533.28/x
  3. Step 3: Cross multiply
    857.69x = 1,286.08 × 533.28
  4. Step 4: Simplify right side
    857.69x = 685,844.23
  5. Step 5: Solve for x
    x = 685,844.23/857.69
  6. Step 6: Final answer
    x = 799.64

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.