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Finding the Fourth Proportional to 47,255.70, 70,915.95 and 20,979.30

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Solution

The fourth proportional to 47,255.70, 70,915.95 and 20,979.30 is: 31,483.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,255.70 : 70,915.95 = 20,979.30 : x
  2. Step 2: Convert to fraction form
    47,255.70/70,915.95 = 20,979.30/x
  3. Step 3: Cross multiply
    47,255.70x = 70,915.95 × 20,979.30
  4. Step 4: Simplify right side
    47,255.70x = 1,487,766,989.84
  5. Step 5: Solve for x
    x = 1,487,766,989.84/47,255.70
  6. Step 6: Final answer
    x = 31,483.33

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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.