Home / 428,678.16-643,029.24-162,388.56

Finding the Fourth Proportional to 428,678.16, 643,029.24 and 162,388.56

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Solution

The fourth proportional to 428,678.16, 643,029.24 and 162,388.56 is: 243,587.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,678.16 : 643,029.24 = 162,388.56 : x
  2. Step 2: Convert to fraction form
    428,678.16/643,029.24 = 162,388.56/x
  3. Step 3: Cross multiply
    428,678.16x = 643,029.24 × 162,388.56
  4. Step 4: Simplify right side
    428,678.16x = 104,420,592,321.49
  5. Step 5: Solve for x
    x = 104,420,592,321.49/428,678.16
  6. Step 6: Final answer
    x = 243,587.39

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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.