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Finding the Fourth Proportional to 428,252.33, 642,378.97 and 128,732.89

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Solution

The fourth proportional to 428,252.33, 642,378.97 and 128,732.89 is: 193,099.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,252.33 : 642,378.97 = 128,732.89 : x
  2. Step 2: Convert to fraction form
    428,252.33/642,378.97 = 128,732.89/x
  3. Step 3: Cross multiply
    428,252.33x = 642,378.97 × 128,732.89
  4. Step 4: Simplify right side
    428,252.33x = 82,695,298,015.46
  5. Step 5: Solve for x
    x = 82,695,298,015.46/428,252.33
  6. Step 6: Final answer
    x = 193,099.47

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Similar ratio
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1.5x scale

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.