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Finding the Fourth Proportional to 919.58, 1,269 and 499.92

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Solution

The fourth proportional to 919.58, 1,269 and 499.92 is: 689.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.58 : 1,269 = 499.92 : x
  2. Step 2: Convert to fraction form
    919.58/1,269 = 499.92/x
  3. Step 3: Cross multiply
    919.58x = 1,269 × 499.92
  4. Step 4: Simplify right side
    919.58x = 634,400.86
  5. Step 5: Solve for x
    x = 634,400.86/919.58
  6. Step 6: Final answer
    x = 689.88

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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.