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Finding the Fourth Proportional to 428,430.92, 642,200.76 and 143,910.32

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Solution

The fourth proportional to 428,430.92, 642,200.76 and 143,910.32 is: 215,715.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,430.92 : 642,200.76 = 143,910.32 : x
  2. Step 2: Convert to fraction form
    428,430.92/642,200.76 = 143,910.32/x
  3. Step 3: Cross multiply
    428,430.92x = 642,200.76 × 143,910.32
  4. Step 4: Simplify right side
    428,430.92x = 92,419,316,875.84
  5. Step 5: Solve for x
    x = 92,419,316,875.84/428,430.92
  6. Step 6: Final answer
    x = 215,715.80

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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.