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Finding the Fourth Proportional to 667,387.98, 920,990.70 and 361,457.46

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Solution

The fourth proportional to 667,387.98, 920,990.70 and 361,457.46 is: 498,808.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,387.98 : 920,990.70 = 361,457.46 : x
  2. Step 2: Convert to fraction form
    667,387.98/920,990.70 = 361,457.46/x
  3. Step 3: Cross multiply
    667,387.98x = 920,990.70 × 361,457.46
  4. Step 4: Simplify right side
    667,387.98x = 332,898,959,105.62
  5. Step 5: Solve for x
    x = 332,898,959,105.62/667,387.98
  6. Step 6: Final answer
    x = 498,808.74

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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.