Home / 428,177.72-642,241.92-128,651.96

Finding the Fourth Proportional to 428,177.72, 642,241.92 and 128,651.96

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Solution

The fourth proportional to 428,177.72, 642,241.92 and 128,651.96 is: 192,970.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,177.72 : 642,241.92 = 128,651.96 : x
  2. Step 2: Convert to fraction form
    428,177.72/642,241.92 = 128,651.96/x
  3. Step 3: Cross multiply
    428,177.72x = 642,241.92 × 128,651.96
  4. Step 4: Simplify right side
    428,177.72x = 82,625,681,802.16
  5. Step 5: Solve for x
    x = 82,625,681,802.16/428,177.72
  6. Step 6: Final answer
    x = 192,970.53

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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.