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Finding the Fourth Proportional to 920.74, 1,380.05 and 458.84

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Solution

The fourth proportional to 920.74, 1,380.05 and 458.84 is: 687.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.74 : 1,380.05 = 458.84 : x
  2. Step 2: Convert to fraction form
    920.74/1,380.05 = 458.84/x
  3. Step 3: Cross multiply
    920.74x = 1,380.05 × 458.84
  4. Step 4: Simplify right side
    920.74x = 633,212.95
  5. Step 5: Solve for x
    x = 633,212.95/920.74
  6. Step 6: Final answer
    x = 687.73

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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.