Home / 428,108.63-642,138.33-128,582.57

Finding the Fourth Proportional to 428,108.63, 642,138.33 and 128,582.57

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Solution

The fourth proportional to 428,108.63, 642,138.33 and 128,582.57 is: 192,866.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,108.63 : 642,138.33 = 128,582.57 : x
  2. Step 2: Convert to fraction form
    428,108.63/642,138.33 = 128,582.57/x
  3. Step 3: Cross multiply
    428,108.63x = 642,138.33 × 128,582.57
  4. Step 4: Simplify right side
    428,108.63x = 82,567,798,854.44
  5. Step 5: Solve for x
    x = 82,567,798,854.44/428,108.63
  6. Step 6: Final answer
    x = 192,866.47

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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.