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Finding the Fourth Proportional to 1,480.78, 2,043.48 and 891.43

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Solution

The fourth proportional to 1,480.78, 2,043.48 and 891.43 is: 1,230.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,480.78 : 2,043.48 = 891.43 : x
  2. Step 2: Convert to fraction form
    1,480.78/2,043.48 = 891.43/x
  3. Step 3: Cross multiply
    1,480.78x = 2,043.48 × 891.43
  4. Step 4: Simplify right side
    1,480.78x = 1,821,618.34
  5. Step 5: Solve for x
    x = 1,821,618.34/1,480.78
  6. Step 6: Final answer
    x = 1,230.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.