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Finding the Fourth Proportional to 640,383.92, 883,823.63 and 385,729.64

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Solution

The fourth proportional to 640,383.92, 883,823.63 and 385,729.64 is: 532,363.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,383.92 : 883,823.63 = 385,729.64 : x
  2. Step 2: Convert to fraction form
    640,383.92/883,823.63 = 385,729.64/x
  3. Step 3: Cross multiply
    640,383.92x = 883,823.63 × 385,729.64
  4. Step 4: Simplify right side
    640,383.92x = 340,916,964,275.63
  5. Step 5: Solve for x
    x = 340,916,964,275.63/640,383.92
  6. Step 6: Final answer
    x = 532,363.41

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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.