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Finding the Fourth Proportional to 1,479.67, 2,219.60 and 505.85

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Solution

The fourth proportional to 1,479.67, 2,219.60 and 505.85 is: 758.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.67 : 2,219.60 = 505.85 : x
  2. Step 2: Convert to fraction form
    1,479.67/2,219.60 = 505.85/x
  3. Step 3: Cross multiply
    1,479.67x = 2,219.60 × 505.85
  4. Step 4: Simplify right side
    1,479.67x = 1,122,774.83
  5. Step 5: Solve for x
    x = 1,122,774.83/1,479.67
  6. Step 6: Final answer
    x = 758.80

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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.