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Finding the Fourth Proportional to 1,979.04, 2,970.21 and 681.42

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Solution

The fourth proportional to 1,979.04, 2,970.21 and 681.42 is: 1,022.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.04 : 2,970.21 = 681.42 : x
  2. Step 2: Convert to fraction form
    1,979.04/2,970.21 = 681.42/x
  3. Step 3: Cross multiply
    1,979.04x = 2,970.21 × 681.42
  4. Step 4: Simplify right side
    1,979.04x = 2,023,960.50
  5. Step 5: Solve for x
    x = 2,023,960.50/1,979.04
  6. Step 6: Final answer
    x = 1,022.70

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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.