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Finding the Fourth Proportional to 316,665.72, 474,954.66 and 79,993.80

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Solution

The fourth proportional to 316,665.72, 474,954.66 and 79,993.80 is: 119,979.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    316,665.72 : 474,954.66 = 79,993.80 : x
  2. Step 2: Convert to fraction form
    316,665.72/474,954.66 = 79,993.80/x
  3. Step 3: Cross multiply
    316,665.72x = 474,954.66 × 79,993.80
  4. Step 4: Simplify right side
    316,665.72x = 37,993,428,081.11
  5. Step 5: Solve for x
    x = 37,993,428,081.11/316,665.72
  6. Step 6: Final answer
    x = 119,979.61

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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.