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Finding the Fourth Proportional to 1,479.41, 2,219.77 and 785.90

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Solution

The fourth proportional to 1,479.41, 2,219.77 and 785.90 is: 1,179.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.41 : 2,219.77 = 785.90 : x
  2. Step 2: Convert to fraction form
    1,479.41/2,219.77 = 785.90/x
  3. Step 3: Cross multiply
    1,479.41x = 2,219.77 × 785.90
  4. Step 4: Simplify right side
    1,479.41x = 1,744,523.52
  5. Step 5: Solve for x
    x = 1,744,523.52/1,479.41
  6. Step 6: Final answer
    x = 1,179.21

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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.