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Finding the Fourth Proportional to 76,443.80, 114,665.70 and 53,115.80

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Solution

The fourth proportional to 76,443.80, 114,665.70 and 53,115.80 is: 79,673.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,443.80 : 114,665.70 = 53,115.80 : x
  2. Step 2: Convert to fraction form
    76,443.80/114,665.70 = 53,115.80/x
  3. Step 3: Cross multiply
    76,443.80x = 114,665.70 × 53,115.80
  4. Step 4: Simplify right side
    76,443.80x = 6,090,560,388.06
  5. Step 5: Solve for x
    x = 6,090,560,388.06/76,443.80
  6. Step 6: Final answer
    x = 79,673.70

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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.