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Finding the Fourth Proportional to 79,478.40, 119,217.30 and 20,313.96

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Solution

The fourth proportional to 79,478.40, 119,217.30 and 20,313.96 is: 30,470.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,478.40 : 119,217.30 = 20,313.96 : x
  2. Step 2: Convert to fraction form
    79,478.40/119,217.30 = 20,313.96/x
  3. Step 3: Cross multiply
    79,478.40x = 119,217.30 × 20,313.96
  4. Step 4: Simplify right side
    79,478.40x = 2,421,775,463.51
  5. Step 5: Solve for x
    x = 2,421,775,463.51/79,478.40
  6. Step 6: Final answer
    x = 30,470.86

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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.