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Finding the Fourth Proportional to 858.37, 1,287.56 and 345.25

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Solution

The fourth proportional to 858.37, 1,287.56 and 345.25 is: 517.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.37 : 1,287.56 = 345.25 : x
  2. Step 2: Convert to fraction form
    858.37/1,287.56 = 345.25/x
  3. Step 3: Cross multiply
    858.37x = 1,287.56 × 345.25
  4. Step 4: Simplify right side
    858.37x = 444,530.09
  5. Step 5: Solve for x
    x = 444,530.09/858.37
  6. Step 6: Final answer
    x = 517.88

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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.