Home / 428,427.05-642,511.04-128,828.10

Finding the Fourth Proportional to 428,427.05, 642,511.04 and 128,828.10

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Solution

The fourth proportional to 428,427.05, 642,511.04 and 128,828.10 is: 193,203.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,427.05 : 642,511.04 = 128,828.10 : x
  2. Step 2: Convert to fraction form
    428,427.05/642,511.04 = 128,828.10/x
  3. Step 3: Cross multiply
    428,427.05x = 642,511.04 × 128,828.10
  4. Step 4: Simplify right side
    428,427.05x = 82,773,476,512.22
  5. Step 5: Solve for x
    x = 82,773,476,512.22/428,427.05
  6. Step 6: Final answer
    x = 193,203.20

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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.