Home / 428,428.05-642,512.54-128,829.10

Finding the Fourth Proportional to 428,428.05, 642,512.54 and 128,829.10

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Solution

The fourth proportional to 428,428.05, 642,512.54 and 128,829.10 is: 193,204.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,428.05 : 642,512.54 = 128,829.10 : x
  2. Step 2: Convert to fraction form
    428,428.05/642,512.54 = 128,829.10/x
  3. Step 3: Cross multiply
    428,428.05x = 642,512.54 × 128,829.10
  4. Step 4: Simplify right side
    428,428.05x = 82,774,310,982.71
  5. Step 5: Solve for x
    x = 82,774,310,982.71/428,428.05
  6. Step 6: Final answer
    x = 193,204.70

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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.