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Finding the Fourth Proportional to 399,455.38, 551,245.57 and 218,167.30

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Solution

The fourth proportional to 399,455.38, 551,245.57 and 218,167.30 is: 301,069.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,455.38 : 551,245.57 = 218,167.30 : x
  2. Step 2: Convert to fraction form
    399,455.38/551,245.57 = 218,167.30/x
  3. Step 3: Cross multiply
    399,455.38x = 551,245.57 × 218,167.30
  4. Step 4: Simplify right side
    399,455.38x = 120,263,757,643.86
  5. Step 5: Solve for x
    x = 120,263,757,643.86/399,455.38
  6. Step 6: Final answer
    x = 301,069.32

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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.