Home / 428,203.25-642,280.17-128,677.40

Finding the Fourth Proportional to 428,203.25, 642,280.17 and 128,677.40

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Solution

The fourth proportional to 428,203.25, 642,280.17 and 128,677.40 is: 193,008.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,203.25 : 642,280.17 = 128,677.40 : x
  2. Step 2: Convert to fraction form
    428,203.25/642,280.17 = 128,677.40/x
  3. Step 3: Cross multiply
    428,203.25x = 642,280.17 × 128,677.40
  4. Step 4: Simplify right side
    428,203.25x = 82,646,942,347.16
  5. Step 5: Solve for x
    x = 82,646,942,347.16/428,203.25
  6. Step 6: Final answer
    x = 193,008.68

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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.