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Finding the Fourth Proportional to 855.35, 1,180.40 and 482.31

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Solution

The fourth proportional to 855.35, 1,180.40 and 482.31 is: 665.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.35 : 1,180.40 = 482.31 : x
  2. Step 2: Convert to fraction form
    855.35/1,180.40 = 482.31/x
  3. Step 3: Cross multiply
    855.35x = 1,180.40 × 482.31
  4. Step 4: Simplify right side
    855.35x = 569,316.31
  5. Step 5: Solve for x
    x = 569,316.31/855.35
  6. Step 6: Final answer
    x = 665.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.