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Finding the Fourth Proportional to 855.35, 1,280.80 and 732.74

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Solution

The fourth proportional to 855.35, 1,280.80 and 732.74 is: 1,097.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.35 : 1,280.80 = 732.74 : x
  2. Step 2: Convert to fraction form
    855.35/1,280.80 = 732.74/x
  3. Step 3: Cross multiply
    855.35x = 1,280.80 × 732.74
  4. Step 4: Simplify right side
    855.35x = 938,497.17
  5. Step 5: Solve for x
    x = 938,497.17/855.35
  6. Step 6: Final answer
    x = 1,097.20

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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.