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Finding the Fourth Proportional to 985.34, 1,478.01 and 254.90

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Solution

The fourth proportional to 985.34, 1,478.01 and 254.90 is: 382.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.34 : 1,478.01 = 254.90 : x
  2. Step 2: Convert to fraction form
    985.34/1,478.01 = 254.90/x
  3. Step 3: Cross multiply
    985.34x = 1,478.01 × 254.90
  4. Step 4: Simplify right side
    985.34x = 376,737.36
  5. Step 5: Solve for x
    x = 376,737.36/985.34
  6. Step 6: Final answer
    x = 382.34

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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.