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Finding the Fourth Proportional to 428,001.84, 642,109.50 and 128,487.96

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Solution

The fourth proportional to 428,001.84, 642,109.50 and 128,487.96 is: 192,763.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,001.84 : 642,109.50 = 128,487.96 : x
  2. Step 2: Convert to fraction form
    428,001.84/642,109.50 = 128,487.96/x
  3. Step 3: Cross multiply
    428,001.84x = 642,109.50 × 128,487.96
  4. Step 4: Simplify right side
    428,001.84x = 82,503,339,751.62
  5. Step 5: Solve for x
    x = 82,503,339,751.62/428,001.84
  6. Step 6: Final answer
    x = 192,763.98

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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.