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Finding the Fourth Proportional to 919.50, 1,268.99 and 505.58

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Solution

The fourth proportional to 919.50, 1,268.99 and 505.58 is: 697.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.50 : 1,268.99 = 505.58 : x
  2. Step 2: Convert to fraction form
    919.50/1,268.99 = 505.58/x
  3. Step 3: Cross multiply
    919.50x = 1,268.99 × 505.58
  4. Step 4: Simplify right side
    919.50x = 641,575.96
  5. Step 5: Solve for x
    x = 641,575.96/919.50
  6. Step 6: Final answer
    x = 697.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.