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Finding the Fourth Proportional to 392,915.28, 542,634.81 and 270,725.40

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Solution

The fourth proportional to 392,915.28, 542,634.81 and 270,725.40 is: 373,884.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,915.28 : 542,634.81 = 270,725.40 : x
  2. Step 2: Convert to fraction form
    392,915.28/542,634.81 = 270,725.40/x
  3. Step 3: Cross multiply
    392,915.28x = 542,634.81 × 270,725.40
  4. Step 4: Simplify right side
    392,915.28x = 146,905,025,991.17
  5. Step 5: Solve for x
    x = 146,905,025,991.17/392,915.28
  6. Step 6: Final answer
    x = 373,884.74

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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.