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Finding the Fourth Proportional to 1,628.69, 2,443.65 and 979.88

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Solution

The fourth proportional to 1,628.69, 2,443.65 and 979.88 is: 1,470.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,628.69 : 2,443.65 = 979.88 : x
  2. Step 2: Convert to fraction form
    1,628.69/2,443.65 = 979.88/x
  3. Step 3: Cross multiply
    1,628.69x = 2,443.65 × 979.88
  4. Step 4: Simplify right side
    1,628.69x = 2,394,483.76
  5. Step 5: Solve for x
    x = 2,394,483.76/1,628.69
  6. Step 6: Final answer
    x = 1,470.19

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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.