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Finding the Fourth Proportional to 260,855.40, 391,428.90 and 111,070.20

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Solution

The fourth proportional to 260,855.40, 391,428.90 and 111,070.20 is: 166,667.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,855.40 : 391,428.90 = 111,070.20 : x
  2. Step 2: Convert to fraction form
    260,855.40/391,428.90 = 111,070.20/x
  3. Step 3: Cross multiply
    260,855.40x = 391,428.90 × 111,070.20
  4. Step 4: Simplify right side
    260,855.40x = 43,476,086,208.78
  5. Step 5: Solve for x
    x = 43,476,086,208.78/260,855.40
  6. Step 6: Final answer
    x = 166,667.38

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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.