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Finding the Fourth Proportional to 428,317.30, 642,477.39 and 108,469

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Solution

The fourth proportional to 428,317.30, 642,477.39 and 108,469 is: 162,703.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,317.30 : 642,477.39 = 108,469 : x
  2. Step 2: Convert to fraction form
    428,317.30/642,477.39 = 108,469/x
  3. Step 3: Cross multiply
    428,317.30x = 642,477.39 × 108,469
  4. Step 4: Simplify right side
    428,317.30x = 69,688,880,015.91
  5. Step 5: Solve for x
    x = 69,688,880,015.91/428,317.30
  6. Step 6: Final answer
    x = 162,703.86

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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.