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Finding the Fourth Proportional to 985.78, 1,478.85 and 336.58

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Solution

The fourth proportional to 985.78, 1,478.85 and 336.58 is: 504.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.78 : 1,478.85 = 336.58 : x
  2. Step 2: Convert to fraction form
    985.78/1,478.85 = 336.58/x
  3. Step 3: Cross multiply
    985.78x = 1,478.85 × 336.58
  4. Step 4: Simplify right side
    985.78x = 497,751.33
  5. Step 5: Solve for x
    x = 497,751.33/985.78
  6. Step 6: Final answer
    x = 504.93

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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.