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Finding the Fourth Proportional to 499.12, 689.70 and 455.20

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Solution

The fourth proportional to 499.12, 689.70 and 455.20 is: 629.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.12 : 689.70 = 455.20 : x
  2. Step 2: Convert to fraction form
    499.12/689.70 = 455.20/x
  3. Step 3: Cross multiply
    499.12x = 689.70 × 455.20
  4. Step 4: Simplify right side
    499.12x = 313,951.44
  5. Step 5: Solve for x
    x = 313,951.44/499.12
  6. Step 6: Final answer
    x = 629.01

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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.