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Finding the Fourth Proportional to 427,084.28, 640,862.88 and 255,885.29

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Solution

The fourth proportional to 427,084.28, 640,862.88 and 255,885.29 is: 383,969.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,084.28 : 640,862.88 = 255,885.29 : x
  2. Step 2: Convert to fraction form
    427,084.28/640,862.88 = 255,885.29/x
  3. Step 3: Cross multiply
    427,084.28x = 640,862.88 × 255,885.29
  4. Step 4: Simplify right side
    427,084.28x = 163,987,380,694.72
  5. Step 5: Solve for x
    x = 163,987,380,694.72/427,084.28
  6. Step 6: Final answer
    x = 383,969.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.