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Finding the Fourth Proportional to 640,985.32, 884,832.10 and 399,387.26

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Solution

The fourth proportional to 640,985.32, 884,832.10 and 399,387.26 is: 551,324.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,985.32 : 884,832.10 = 399,387.26 : x
  2. Step 2: Convert to fraction form
    640,985.32/884,832.10 = 399,387.26/x
  3. Step 3: Cross multiply
    640,985.32x = 884,832.10 × 399,387.26
  4. Step 4: Simplify right side
    640,985.32x = 353,390,665,338.76
  5. Step 5: Solve for x
    x = 353,390,665,338.76/640,985.32
  6. Step 6: Final answer
    x = 551,324.12

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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.