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Finding the Fourth Proportional to 428,237.28, 642,330 and 112,693.68

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Solution

The fourth proportional to 428,237.28, 642,330 and 112,693.68 is: 169,033.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,237.28 : 642,330 = 112,693.68 : x
  2. Step 2: Convert to fraction form
    428,237.28/642,330 = 112,693.68/x
  3. Step 3: Cross multiply
    428,237.28x = 642,330 × 112,693.68
  4. Step 4: Simplify right side
    428,237.28x = 72,386,531,474.40
  5. Step 5: Solve for x
    x = 72,386,531,474.40/428,237.28
  6. Step 6: Final answer
    x = 169,033.70

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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.