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Finding the Fourth Proportional to 640,985.53, 884,832.39 and 399,387.47

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Solution

The fourth proportional to 640,985.53, 884,832.39 and 399,387.47 is: 551,324.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,985.53 : 884,832.39 = 399,387.47 : x
  2. Step 2: Convert to fraction form
    640,985.53/884,832.39 = 399,387.47/x
  3. Step 3: Cross multiply
    640,985.53x = 884,832.39 × 399,387.47
  4. Step 4: Simplify right side
    640,985.53x = 353,390,969,454.80
  5. Step 5: Solve for x
    x = 353,390,969,454.80/640,985.53
  6. Step 6: Final answer
    x = 551,324.41

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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.