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Finding the Fourth Proportional to 1,214.60, 1,820.78 and 484

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Solution

The fourth proportional to 1,214.60, 1,820.78 and 484 is: 725.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.60 : 1,820.78 = 484 : x
  2. Step 2: Convert to fraction form
    1,214.60/1,820.78 = 484/x
  3. Step 3: Cross multiply
    1,214.60x = 1,820.78 × 484
  4. Step 4: Simplify right side
    1,214.60x = 881,257.52
  5. Step 5: Solve for x
    x = 881,257.52/1,214.60
  6. Step 6: Final answer
    x = 725.55

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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.