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Finding the Fourth Proportional to 90,750.92, 135,939.12 and 53,196.96

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Solution

The fourth proportional to 90,750.92, 135,939.12 and 53,196.96 is: 79,685.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,750.92 : 135,939.12 = 53,196.96 : x
  2. Step 2: Convert to fraction form
    90,750.92/135,939.12 = 53,196.96/x
  3. Step 3: Cross multiply
    90,750.92x = 135,939.12 × 53,196.96
  4. Step 4: Simplify right side
    90,750.92x = 7,231,547,929.08
  5. Step 5: Solve for x
    x = 7,231,547,929.08/90,750.92
  6. Step 6: Final answer
    x = 79,685.67

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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.