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Finding the Fourth Proportional to 572,668.80, 790,309.20 and 318,021.12

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Solution

The fourth proportional to 572,668.80, 790,309.20 and 318,021.12 is: 438,883.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    572,668.80 : 790,309.20 = 318,021.12 : x
  2. Step 2: Convert to fraction form
    572,668.80/790,309.20 = 318,021.12/x
  3. Step 3: Cross multiply
    572,668.80x = 790,309.20 × 318,021.12
  4. Step 4: Simplify right side
    572,668.80x = 251,335,016,930.30
  5. Step 5: Solve for x
    x = 251,335,016,930.30/572,668.80
  6. Step 6: Final answer
    x = 438,883.73

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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.