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Finding the Fourth Proportional to 979.31, 1,469.93 and 666

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Solution

The fourth proportional to 979.31, 1,469.93 and 666 is: 999.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.31 : 1,469.93 = 666 : x
  2. Step 2: Convert to fraction form
    979.31/1,469.93 = 666/x
  3. Step 3: Cross multiply
    979.31x = 1,469.93 × 666
  4. Step 4: Simplify right side
    979.31x = 978,973.38
  5. Step 5: Solve for x
    x = 978,973.38/979.31
  6. Step 6: Final answer
    x = 999.66

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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.