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Finding the Fourth Proportional to 260,780.80, 391,430.40 and 127,811.20

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Solution

The fourth proportional to 260,780.80, 391,430.40 and 127,811.20 is: 191,843.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,780.80 : 391,430.40 = 127,811.20 : x
  2. Step 2: Convert to fraction form
    260,780.80/391,430.40 = 127,811.20/x
  3. Step 3: Cross multiply
    260,780.80x = 391,430.40 × 127,811.20
  4. Step 4: Simplify right side
    260,780.80x = 50,029,189,140.48
  5. Step 5: Solve for x
    x = 50,029,189,140.48/260,780.80
  6. Step 6: Final answer
    x = 191,843.84

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1.5x scale

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.