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Finding the Fourth Proportional to 391,410.75, 540,147.20 and 212,562.75

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Solution

The fourth proportional to 391,410.75, 540,147.20 and 212,562.75 is: 293,336.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,410.75 : 540,147.20 = 212,562.75 : x
  2. Step 2: Convert to fraction form
    391,410.75/540,147.20 = 212,562.75/x
  3. Step 3: Cross multiply
    391,410.75x = 540,147.20 × 212,562.75
  4. Step 4: Simplify right side
    391,410.75x = 114,815,173,173.99
  5. Step 5: Solve for x
    x = 114,815,173,173.99/391,410.75
  6. Step 6: Final answer
    x = 293,336.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.