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Finding the Fourth Proportional to 979.95, 1,469.44 and 485.79

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Solution

The fourth proportional to 979.95, 1,469.44 and 485.79 is: 728.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.95 : 1,469.44 = 485.79 : x
  2. Step 2: Convert to fraction form
    979.95/1,469.44 = 485.79/x
  3. Step 3: Cross multiply
    979.95x = 1,469.44 × 485.79
  4. Step 4: Simplify right side
    979.95x = 713,839.26
  5. Step 5: Solve for x
    x = 713,839.26/979.95
  6. Step 6: Final answer
    x = 728.44

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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.