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Finding the Fourth Proportional to 260,722.80, 390,925.80 and 102,769.20

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Solution

The fourth proportional to 260,722.80, 390,925.80 and 102,769.20 is: 154,091.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,722.80 : 390,925.80 = 102,769.20 : x
  2. Step 2: Convert to fraction form
    260,722.80/390,925.80 = 102,769.20/x
  3. Step 3: Cross multiply
    260,722.80x = 390,925.80 × 102,769.20
  4. Step 4: Simplify right side
    260,722.80x = 40,175,131,725.36
  5. Step 5: Solve for x
    x = 40,175,131,725.36/260,722.80
  6. Step 6: Final answer
    x = 154,091.36

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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.