Home / 428,598.09-642,895.85-108,749.34

Finding the Fourth Proportional to 428,598.09, 642,895.85 and 108,749.34

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Solution

The fourth proportional to 428,598.09, 642,895.85 and 108,749.34 is: 163,123.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,598.09 : 642,895.85 = 108,749.34 : x
  2. Step 2: Convert to fraction form
    428,598.09/642,895.85 = 108,749.34/x
  3. Step 3: Cross multiply
    428,598.09x = 642,895.85 × 108,749.34
  4. Step 4: Simplify right side
    428,598.09x = 69,914,499,479.44
  5. Step 5: Solve for x
    x = 69,914,499,479.44/428,598.09
  6. Step 6: Final answer
    x = 163,123.68

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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.