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Finding the Fourth Proportional to 391,995.42, 540,921 and 219,889.45

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Solution

The fourth proportional to 391,995.42, 540,921 and 219,889.45 is: 303,429.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,995.42 : 540,921 = 219,889.45 : x
  2. Step 2: Convert to fraction form
    391,995.42/540,921 = 219,889.45/x
  3. Step 3: Cross multiply
    391,995.42x = 540,921 × 219,889.45
  4. Step 4: Simplify right side
    391,995.42x = 118,942,821,183.45
  5. Step 5: Solve for x
    x = 118,942,821,183.45/391,995.42
  6. Step 6: Final answer
    x = 303,429.11

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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.