Home / 428,899.20-643,344.80-109,051.76

Finding the Fourth Proportional to 428,899.20, 643,344.80 and 109,051.76

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Solution

The fourth proportional to 428,899.20, 643,344.80 and 109,051.76 is: 163,576.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,899.20 : 643,344.80 = 109,051.76 : x
  2. Step 2: Convert to fraction form
    428,899.20/643,344.80 = 109,051.76/x
  3. Step 3: Cross multiply
    428,899.20x = 643,344.80 × 109,051.76
  4. Step 4: Simplify right side
    428,899.20x = 70,157,882,726.85
  5. Step 5: Solve for x
    x = 70,157,882,726.85/428,899.20
  6. Step 6: Final answer
    x = 163,576.62

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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.