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Finding the Fourth Proportional to 985.91, 1,478.93 and 255.47

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Solution

The fourth proportional to 985.91, 1,478.93 and 255.47 is: 383.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.91 : 1,478.93 = 255.47 : x
  2. Step 2: Convert to fraction form
    985.91/1,478.93 = 255.47/x
  3. Step 3: Cross multiply
    985.91x = 1,478.93 × 255.47
  4. Step 4: Simplify right side
    985.91x = 377,813.58
  5. Step 5: Solve for x
    x = 377,813.58/985.91
  6. Step 6: Final answer
    x = 383.21

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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.