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Finding the Fourth Proportional to 985.87, 1,478.81 and 336.43

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Solution

The fourth proportional to 985.87, 1,478.81 and 336.43 is: 504.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.87 : 1,478.81 = 336.43 : x
  2. Step 2: Convert to fraction form
    985.87/1,478.81 = 336.43/x
  3. Step 3: Cross multiply
    985.87x = 1,478.81 × 336.43
  4. Step 4: Simplify right side
    985.87x = 497,516.05
  5. Step 5: Solve for x
    x = 497,516.05/985.87
  6. Step 6: Final answer
    x = 504.65

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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.