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Finding the Fourth Proportional to 919.90, 1,380.54 and 573.74

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Solution

The fourth proportional to 919.90, 1,380.54 and 573.74 is: 861.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.90 : 1,380.54 = 573.74 : x
  2. Step 2: Convert to fraction form
    919.90/1,380.54 = 573.74/x
  3. Step 3: Cross multiply
    919.90x = 1,380.54 × 573.74
  4. Step 4: Simplify right side
    919.90x = 792,071.02
  5. Step 5: Solve for x
    x = 792,071.02/919.90
  6. Step 6: Final answer
    x = 861.04

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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.