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Finding the Fourth Proportional to 159,603.21, 220,231.71 and 91,623.15

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Solution

The fourth proportional to 159,603.21, 220,231.71 and 91,623.15 is: 126,428.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,603.21 : 220,231.71 = 91,623.15 : x
  2. Step 2: Convert to fraction form
    159,603.21/220,231.71 = 91,623.15/x
  3. Step 3: Cross multiply
    159,603.21x = 220,231.71 × 91,623.15
  4. Step 4: Simplify right side
    159,603.21x = 20,178,323,000.09
  5. Step 5: Solve for x
    x = 20,178,323,000.09/159,603.21
  6. Step 6: Final answer
    x = 126,428.05

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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.