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Finding the Fourth Proportional to 159,428.64, 220,012.08 and 87,813.60

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Solution

The fourth proportional to 159,428.64, 220,012.08 and 87,813.60 is: 121,183.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,428.64 : 220,012.08 = 87,813.60 : x
  2. Step 2: Convert to fraction form
    159,428.64/220,012.08 = 87,813.60/x
  3. Step 3: Cross multiply
    159,428.64x = 220,012.08 × 87,813.60
  4. Step 4: Simplify right side
    159,428.64x = 19,320,052,788.29
  5. Step 5: Solve for x
    x = 19,320,052,788.29/159,428.64
  6. Step 6: Final answer
    x = 121,183.07

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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.