Home / 428,961.25-643,425.72-129,433.87

Finding the Fourth Proportional to 428,961.25, 643,425.72 and 129,433.87

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Solution

The fourth proportional to 428,961.25, 643,425.72 and 129,433.87 is: 194,145.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,961.25 : 643,425.72 = 129,433.87 : x
  2. Step 2: Convert to fraction form
    428,961.25/643,425.72 = 129,433.87/x
  3. Step 3: Cross multiply
    428,961.25x = 643,425.72 × 129,433.87
  4. Step 4: Simplify right side
    428,961.25x = 83,281,080,997.14
  5. Step 5: Solve for x
    x = 83,281,080,997.14/428,961.25
  6. Step 6: Final answer
    x = 194,145.93

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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.