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Finding the Fourth Proportional to 640,986.37, 884,833.55 and 399,388.31

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Solution

The fourth proportional to 640,986.37, 884,833.55 and 399,388.31 is: 551,325.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,986.37 : 884,833.55 = 399,388.31 : x
  2. Step 2: Convert to fraction form
    640,986.37/884,833.55 = 399,388.31/x
  3. Step 3: Cross multiply
    640,986.37x = 884,833.55 × 399,388.31
  4. Step 4: Simplify right side
    640,986.37x = 353,392,173,953.72
  5. Step 5: Solve for x
    x = 353,392,173,953.72/640,986.37
  6. Step 6: Final answer
    x = 551,325.57

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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.