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Finding the Fourth Proportional to 260,739.60, 391,109.40 and 102,886.80

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Solution

The fourth proportional to 260,739.60, 391,109.40 and 102,886.80 is: 154,330.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,739.60 : 391,109.40 = 102,886.80 : x
  2. Step 2: Convert to fraction form
    260,739.60/391,109.40 = 102,886.80/x
  3. Step 3: Cross multiply
    260,739.60x = 391,109.40 × 102,886.80
  4. Step 4: Simplify right side
    260,739.60x = 40,239,994,615.92
  5. Step 5: Solve for x
    x = 40,239,994,615.92/260,739.60
  6. Step 6: Final answer
    x = 154,330.20

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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.