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Finding the Fourth Proportional to 855.40, 1,283.73 and 636.52

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Solution

The fourth proportional to 855.40, 1,283.73 and 636.52 is: 955.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.40 : 1,283.73 = 636.52 : x
  2. Step 2: Convert to fraction form
    855.40/1,283.73 = 636.52/x
  3. Step 3: Cross multiply
    855.40x = 1,283.73 × 636.52
  4. Step 4: Simplify right side
    855.40x = 817,119.82
  5. Step 5: Solve for x
    x = 817,119.82/855.40
  6. Step 6: Final answer
    x = 955.25

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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.