Home / 428,253.71-642,381.03-128,734.26

Finding the Fourth Proportional to 428,253.71, 642,381.03 and 128,734.26

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Solution

The fourth proportional to 428,253.71, 642,381.03 and 128,734.26 is: 193,101.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,253.71 : 642,381.03 = 128,734.26 : x
  2. Step 2: Convert to fraction form
    428,253.71/642,381.03 = 128,734.26/x
  3. Step 3: Cross multiply
    428,253.71x = 642,381.03 × 128,734.26
  4. Step 4: Simplify right side
    428,253.71x = 82,696,446,535.09
  5. Step 5: Solve for x
    x = 82,696,446,535.09/428,253.71
  6. Step 6: Final answer
    x = 193,101.53

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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.