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Finding the Fourth Proportional to 667,970.52, 921,700.90 and 406,192.28

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Solution

The fourth proportional to 667,970.52, 921,700.90 and 406,192.28 is: 560,485.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,970.52 : 921,700.90 = 406,192.28 : x
  2. Step 2: Convert to fraction form
    667,970.52/921,700.90 = 406,192.28/x
  3. Step 3: Cross multiply
    667,970.52x = 921,700.90 × 406,192.28
  4. Step 4: Simplify right side
    667,970.52x = 374,387,790,049.05
  5. Step 5: Solve for x
    x = 374,387,790,049.05/667,970.52
  6. Step 6: Final answer
    x = 560,485.50

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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.