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Finding the Fourth Proportional to 259,431.40, 389,099.10 and 72,404.20

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Solution

The fourth proportional to 259,431.40, 389,099.10 and 72,404.20 is: 108,592.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,431.40 : 389,099.10 = 72,404.20 : x
  2. Step 2: Convert to fraction form
    259,431.40/389,099.10 = 72,404.20/x
  3. Step 3: Cross multiply
    259,431.40x = 389,099.10 × 72,404.20
  4. Step 4: Simplify right side
    259,431.40x = 28,172,409,056.22
  5. Step 5: Solve for x
    x = 28,172,409,056.22/259,431.40
  6. Step 6: Final answer
    x = 108,592.90

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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.