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Finding the Fourth Proportional to 855.36, 1,281.96 and 712.80

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Solution

The fourth proportional to 855.36, 1,281.96 and 712.80 is: 1,068.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.36 : 1,281.96 = 712.80 : x
  2. Step 2: Convert to fraction form
    855.36/1,281.96 = 712.80/x
  3. Step 3: Cross multiply
    855.36x = 1,281.96 × 712.80
  4. Step 4: Simplify right side
    855.36x = 913,781.09
  5. Step 5: Solve for x
    x = 913,781.09/855.36
  6. Step 6: Final answer
    x = 1,068.30

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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.