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Finding the Fourth Proportional to 979.45, 1,468.69 and 485.29

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Solution

The fourth proportional to 979.45, 1,468.69 and 485.29 is: 727.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.45 : 1,468.69 = 485.29 : x
  2. Step 2: Convert to fraction form
    979.45/1,468.69 = 485.29/x
  3. Step 3: Cross multiply
    979.45x = 1,468.69 × 485.29
  4. Step 4: Simplify right side
    979.45x = 712,740.57
  5. Step 5: Solve for x
    x = 712,740.57/979.45
  6. Step 6: Final answer
    x = 727.69

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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.