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Finding the Fourth Proportional to 641,813.12, 885,697.44 and 387,304.64

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Solution

The fourth proportional to 641,813.12, 885,697.44 and 387,304.64 is: 534,477.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,813.12 : 885,697.44 = 387,304.64 : x
  2. Step 2: Convert to fraction form
    641,813.12/885,697.44 = 387,304.64/x
  3. Step 3: Cross multiply
    641,813.12x = 885,697.44 × 387,304.64
  4. Step 4: Simplify right side
    641,813.12x = 343,034,728,148.12
  5. Step 5: Solve for x
    x = 343,034,728,148.12/641,813.12
  6. Step 6: Final answer
    x = 534,477.59

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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.