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Finding the Fourth Proportional to 620,402.67, 855,937.67 and 405,668.43

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Solution

The fourth proportional to 620,402.67, 855,937.67 and 405,668.43 is: 559,679.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,402.67 : 855,937.67 = 405,668.43 : x
  2. Step 2: Convert to fraction form
    620,402.67/855,937.67 = 405,668.43/x
  3. Step 3: Cross multiply
    620,402.67x = 855,937.67 × 405,668.43
  4. Step 4: Simplify right side
    620,402.67x = 347,226,888,738.42
  5. Step 5: Solve for x
    x = 347,226,888,738.42/620,402.67
  6. Step 6: Final answer
    x = 559,679.87

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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.