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Finding the Fourth Proportional to 1,978.40, 2,968.61 and 809.26

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Solution

The fourth proportional to 1,978.40, 2,968.61 and 809.26 is: 1,214.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978.40 : 2,968.61 = 809.26 : x
  2. Step 2: Convert to fraction form
    1,978.40/2,968.61 = 809.26/x
  3. Step 3: Cross multiply
    1,978.40x = 2,968.61 × 809.26
  4. Step 4: Simplify right side
    1,978.40x = 2,402,376.99
  5. Step 5: Solve for x
    x = 2,402,376.99/1,978.40
  6. Step 6: Final answer
    x = 1,214.31

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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.