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Finding the Fourth Proportional to 259,676.80, 389,486.40 and 72,707.20

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Solution

The fourth proportional to 259,676.80, 389,486.40 and 72,707.20 is: 109,052.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,676.80 : 389,486.40 = 72,707.20 : x
  2. Step 2: Convert to fraction form
    259,676.80/389,486.40 = 72,707.20/x
  3. Step 3: Cross multiply
    259,676.80x = 389,486.40 × 72,707.20
  4. Step 4: Simplify right side
    259,676.80x = 28,318,465,582.08
  5. Step 5: Solve for x
    x = 28,318,465,582.08/259,676.80
  6. Step 6: Final answer
    x = 109,052.74

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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.