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Finding the Fourth Proportional to 640,589.02, 883,978.16 and 354,090.66

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Solution

The fourth proportional to 640,589.02, 883,978.16 and 354,090.66 is: 488,625.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,589.02 : 883,978.16 = 354,090.66 : x
  2. Step 2: Convert to fraction form
    640,589.02/883,978.16 = 354,090.66/x
  3. Step 3: Cross multiply
    640,589.02x = 883,978.16 × 354,090.66
  4. Step 4: Simplify right side
    640,589.02x = 313,008,407,006.37
  5. Step 5: Solve for x
    x = 313,008,407,006.37/640,589.02
  6. Step 6: Final answer
    x = 488,625.93

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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.