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Finding the Fourth Proportional to 260,884.80, 391,586.40 and 127,915.20

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Solution

The fourth proportional to 260,884.80, 391,586.40 and 127,915.20 is: 191,999.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,884.80 : 391,586.40 = 127,915.20 : x
  2. Step 2: Convert to fraction form
    260,884.80/391,586.40 = 127,915.20/x
  3. Step 3: Cross multiply
    260,884.80x = 391,586.40 × 127,915.20
  4. Step 4: Simplify right side
    260,884.80x = 50,089,852,673.28
  5. Step 5: Solve for x
    x = 50,089,852,673.28/260,884.80
  6. Step 6: Final answer
    x = 191,999.89

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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.