Home / 428,780.92-643,556.87-229,271.84

Finding the Fourth Proportional to 428,780.92, 643,556.87 and 229,271.84

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Solution

The fourth proportional to 428,780.92, 643,556.87 and 229,271.84 is: 344,113.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,780.92 : 643,556.87 = 229,271.84 : x
  2. Step 2: Convert to fraction form
    428,780.92/643,556.87 = 229,271.84/x
  3. Step 3: Cross multiply
    428,780.92x = 643,556.87 × 229,271.84
  4. Step 4: Simplify right side
    428,780.92x = 147,549,467,729.54
  5. Step 5: Solve for x
    x = 147,549,467,729.54/428,780.92
  6. Step 6: Final answer
    x = 344,113.88

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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.