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Finding the Fourth Proportional to 857.36, 1,286.18 and 395.60

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Solution

The fourth proportional to 857.36, 1,286.18 and 395.60 is: 593.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.36 : 1,286.18 = 395.60 : x
  2. Step 2: Convert to fraction form
    857.36/1,286.18 = 395.60/x
  3. Step 3: Cross multiply
    857.36x = 1,286.18 × 395.60
  4. Step 4: Simplify right side
    857.36x = 508,812.81
  5. Step 5: Solve for x
    x = 508,812.81/857.36
  6. Step 6: Final answer
    x = 593.46

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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.