Home / 428,225.25-642,127.69-211,833.97

Finding the Fourth Proportional to 428,225.25, 642,127.69 and 211,833.97

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Solution

The fourth proportional to 428,225.25, 642,127.69 and 211,833.97 is: 317,646.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,225.25 : 642,127.69 = 211,833.97 : x
  2. Step 2: Convert to fraction form
    428,225.25/642,127.69 = 211,833.97/x
  3. Step 3: Cross multiply
    428,225.25x = 642,127.69 × 211,833.97
  4. Step 4: Simplify right side
    428,225.25x = 136,024,457,819.63
  5. Step 5: Solve for x
    x = 136,024,457,819.63/428,225.25
  6. Step 6: Final answer
    x = 317,646.98

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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.