Home / 287,221.68-396,379-159,905.36

Finding the Fourth Proportional to 287,221.68, 396,379 and 159,905.36

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Solution

The fourth proportional to 287,221.68, 396,379 and 159,905.36 is: 220,676.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,221.68 : 396,379 = 159,905.36 : x
  2. Step 2: Convert to fraction form
    287,221.68/396,379 = 159,905.36/x
  3. Step 3: Cross multiply
    287,221.68x = 396,379 × 159,905.36
  4. Step 4: Simplify right side
    287,221.68x = 63,383,126,691.44
  5. Step 5: Solve for x
    x = 63,383,126,691.44/287,221.68
  6. Step 6: Final answer
    x = 220,676.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.