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Finding the Fourth Proportional to 919.34, 1,268.70 and 505.34

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Solution

The fourth proportional to 919.34, 1,268.70 and 505.34 is: 697.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.34 : 1,268.70 = 505.34 : x
  2. Step 2: Convert to fraction form
    919.34/1,268.70 = 505.34/x
  3. Step 3: Cross multiply
    919.34x = 1,268.70 × 505.34
  4. Step 4: Simplify right side
    919.34x = 641,124.86
  5. Step 5: Solve for x
    x = 641,124.86/919.34
  6. Step 6: Final answer
    x = 697.38

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Double scale
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1.5x scale

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.