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Finding the Fourth Proportional to 982.76, 1,474.80 and 405.62

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Solution

The fourth proportional to 982.76, 1,474.80 and 405.62 is: 608.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.76 : 1,474.80 = 405.62 : x
  2. Step 2: Convert to fraction form
    982.76/1,474.80 = 405.62/x
  3. Step 3: Cross multiply
    982.76x = 1,474.80 × 405.62
  4. Step 4: Simplify right side
    982.76x = 598,208.38
  5. Step 5: Solve for x
    x = 598,208.38/982.76
  6. Step 6: Final answer
    x = 608.70

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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.