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Finding the Fourth Proportional to 985.42, 1,478.02 and 255.06

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Solution

The fourth proportional to 985.42, 1,478.02 and 255.06 is: 382.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.42 : 1,478.02 = 255.06 : x
  2. Step 2: Convert to fraction form
    985.42/1,478.02 = 255.06/x
  3. Step 3: Cross multiply
    985.42x = 1,478.02 × 255.06
  4. Step 4: Simplify right side
    985.42x = 376,983.78
  5. Step 5: Solve for x
    x = 376,983.78/985.42
  6. Step 6: Final answer
    x = 382.56

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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.