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Finding the Fourth Proportional to 985.47, 1,478.29 and 255.04

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Solution

The fourth proportional to 985.47, 1,478.29 and 255.04 is: 382.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.47 : 1,478.29 = 255.04 : x
  2. Step 2: Convert to fraction form
    985.47/1,478.29 = 255.04/x
  3. Step 3: Cross multiply
    985.47x = 1,478.29 × 255.04
  4. Step 4: Simplify right side
    985.47x = 377,023.08
  5. Step 5: Solve for x
    x = 377,023.08/985.47
  6. Step 6: Final answer
    x = 382.58

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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.