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Finding the Fourth Proportional to 1,478.42, 2,218.49 and 820.84

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Solution

The fourth proportional to 1,478.42, 2,218.49 and 820.84 is: 1,231.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.42 : 2,218.49 = 820.84 : x
  2. Step 2: Convert to fraction form
    1,478.42/2,218.49 = 820.84/x
  3. Step 3: Cross multiply
    1,478.42x = 2,218.49 × 820.84
  4. Step 4: Simplify right side
    1,478.42x = 1,821,026.77
  5. Step 5: Solve for x
    x = 1,821,026.77/1,478.42
  6. Step 6: Final answer
    x = 1,231.74

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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.