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Finding the Fourth Proportional to 985.40, 1,478.10 and 254.91

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Solution

The fourth proportional to 985.40, 1,478.10 and 254.91 is: 382.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.40 : 1,478.10 = 254.91 : x
  2. Step 2: Convert to fraction form
    985.40/1,478.10 = 254.91/x
  3. Step 3: Cross multiply
    985.40x = 1,478.10 × 254.91
  4. Step 4: Simplify right side
    985.40x = 376,787.54
  5. Step 5: Solve for x
    x = 376,787.54/985.40
  6. Step 6: Final answer
    x = 382.37

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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.