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Finding the Fourth Proportional to 399,668.90, 551,543.22 and 215,907.54

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Solution

The fourth proportional to 399,668.90, 551,543.22 and 215,907.54 is: 297,952.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,668.90 : 551,543.22 = 215,907.54 : x
  2. Step 2: Convert to fraction form
    399,668.90/551,543.22 = 215,907.54/x
  3. Step 3: Cross multiply
    399,668.90x = 551,543.22 × 215,907.54
  4. Step 4: Simplify right side
    399,668.90x = 119,082,339,833.88
  5. Step 5: Solve for x
    x = 119,082,339,833.88/399,668.90
  6. Step 6: Final answer
    x = 297,952.48

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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.