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Finding the Fourth Proportional to 640,987.32, 884,834.87 and 399,389.27

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Solution

The fourth proportional to 640,987.32, 884,834.87 and 399,389.27 is: 551,326.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,987.32 : 884,834.87 = 399,389.27 : x
  2. Step 2: Convert to fraction form
    640,987.32/884,834.87 = 399,389.27/x
  3. Step 3: Cross multiply
    640,987.32x = 884,834.87 × 399,389.27
  4. Step 4: Simplify right side
    640,987.32x = 353,393,546,378.72
  5. Step 5: Solve for x
    x = 353,393,546,378.72/640,987.32
  6. Step 6: Final answer
    x = 551,326.89

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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.