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Finding the Fourth Proportional to 260,091.20, 390,136.80 and 225,876.80

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Solution

The fourth proportional to 260,091.20, 390,136.80 and 225,876.80 is: 338,815.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,091.20 : 390,136.80 = 225,876.80 : x
  2. Step 2: Convert to fraction form
    260,091.20/390,136.80 = 225,876.80/x
  3. Step 3: Cross multiply
    260,091.20x = 390,136.80 × 225,876.80
  4. Step 4: Simplify right side
    260,091.20x = 88,122,851,946.24
  5. Step 5: Solve for x
    x = 88,122,851,946.24/260,091.20
  6. Step 6: Final answer
    x = 338,815.20

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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.