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Finding the Fourth Proportional to 982.18, 1,469.59 and 929.43

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Solution

The fourth proportional to 982.18, 1,469.59 and 929.43 is: 1,390.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.18 : 1,469.59 = 929.43 : x
  2. Step 2: Convert to fraction form
    982.18/1,469.59 = 929.43/x
  3. Step 3: Cross multiply
    982.18x = 1,469.59 × 929.43
  4. Step 4: Simplify right side
    982.18x = 1,365,881.03
  5. Step 5: Solve for x
    x = 1,365,881.03/982.18
  6. Step 6: Final answer
    x = 1,390.66

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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.