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Finding the Fourth Proportional to 640,203.79, 883,499.05 and 353,742.33

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Solution

The fourth proportional to 640,203.79, 883,499.05 and 353,742.33 is: 488,174.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,203.79 : 883,499.05 = 353,742.33 : x
  2. Step 2: Convert to fraction form
    640,203.79/883,499.05 = 353,742.33/x
  3. Step 3: Cross multiply
    640,203.79x = 883,499.05 × 353,742.33
  4. Step 4: Simplify right side
    640,203.79x = 312,531,012,499.79
  5. Step 5: Solve for x
    x = 312,531,012,499.79/640,203.79
  6. Step 6: Final answer
    x = 488,174.26

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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.