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Finding the Fourth Proportional to 667,244.37, 921,021.80 and 405,598.78

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Solution

The fourth proportional to 667,244.37, 921,021.80 and 405,598.78 is: 559,862.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,244.37 : 921,021.80 = 405,598.78 : x
  2. Step 2: Convert to fraction form
    667,244.37/921,021.80 = 405,598.78/x
  3. Step 3: Cross multiply
    667,244.37x = 921,021.80 × 405,598.78
  4. Step 4: Simplify right side
    667,244.37x = 373,565,318,433.40
  5. Step 5: Solve for x
    x = 373,565,318,433.40/667,244.37
  6. Step 6: Final answer
    x = 559,862.83

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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.