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Finding the Fourth Proportional to 982.75, 1,474.80 and 405.63

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Solution

The fourth proportional to 982.75, 1,474.80 and 405.63 is: 608.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.75 : 1,474.80 = 405.63 : x
  2. Step 2: Convert to fraction form
    982.75/1,474.80 = 405.63/x
  3. Step 3: Cross multiply
    982.75x = 1,474.80 × 405.63
  4. Step 4: Simplify right side
    982.75x = 598,223.12
  5. Step 5: Solve for x
    x = 598,223.12/982.75
  6. Step 6: Final answer
    x = 608.72

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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.