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Finding the Fourth Proportional to 572,639.43, 790,243.83 and 317,990.61

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Solution

The fourth proportional to 572,639.43, 790,243.83 and 317,990.61 is: 438,827.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    572,639.43 : 790,243.83 = 317,990.61 : x
  2. Step 2: Convert to fraction form
    572,639.43/790,243.83 = 317,990.61/x
  3. Step 3: Cross multiply
    572,639.43x = 790,243.83 × 317,990.61
  4. Step 4: Simplify right side
    572,639.43x = 251,290,117,550.44
  5. Step 5: Solve for x
    x = 251,290,117,550.44/572,639.43
  6. Step 6: Final answer
    x = 438,827.83

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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.