Home / 428,253.46-642,380.66-128,734.01

Finding the Fourth Proportional to 428,253.46, 642,380.66 and 128,734.01

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Solution

The fourth proportional to 428,253.46, 642,380.66 and 128,734.01 is: 193,101.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,253.46 : 642,380.66 = 128,734.01 : x
  2. Step 2: Convert to fraction form
    428,253.46/642,380.66 = 128,734.01/x
  3. Step 3: Cross multiply
    428,253.46x = 642,380.66 × 128,734.01
  4. Step 4: Simplify right side
    428,253.46x = 82,696,239,151.05
  5. Step 5: Solve for x
    x = 82,696,239,151.05/428,253.46
  6. Step 6: Final answer
    x = 193,101.16

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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.