Home / 428,356.96-642,616.56-172,209.34

Finding the Fourth Proportional to 428,356.96, 642,616.56 and 172,209.34

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Solution

The fourth proportional to 428,356.96, 642,616.56 and 172,209.34 is: 258,346.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,356.96 : 642,616.56 = 172,209.34 : x
  2. Step 2: Convert to fraction form
    428,356.96/642,616.56 = 172,209.34/x
  3. Step 3: Cross multiply
    428,356.96x = 642,616.56 × 172,209.34
  4. Step 4: Simplify right side
    428,356.96x = 110,664,573,670.67
  5. Step 5: Solve for x
    x = 110,664,573,670.67/428,356.96
  6. Step 6: Final answer
    x = 258,346.62

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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.