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Finding the Fourth Proportional to 1,979.60, 2,969.72 and 680.76

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Solution

The fourth proportional to 1,979.60, 2,969.72 and 680.76 is: 1,021.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.60 : 2,969.72 = 680.76 : x
  2. Step 2: Convert to fraction form
    1,979.60/2,969.72 = 680.76/x
  3. Step 3: Cross multiply
    1,979.60x = 2,969.72 × 680.76
  4. Step 4: Simplify right side
    1,979.60x = 2,021,663.18
  5. Step 5: Solve for x
    x = 2,021,663.18/1,979.60
  6. Step 6: Final answer
    x = 1,021.25

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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.