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Finding the Fourth Proportional to 316,663.72, 474,951.66 and 79,991.80

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Solution

The fourth proportional to 316,663.72, 474,951.66 and 79,991.80 is: 119,976.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    316,663.72 : 474,951.66 = 79,991.80 : x
  2. Step 2: Convert to fraction form
    316,663.72/474,951.66 = 79,991.80/x
  3. Step 3: Cross multiply
    316,663.72x = 474,951.66 × 79,991.80
  4. Step 4: Simplify right side
    316,663.72x = 37,992,238,196.39
  5. Step 5: Solve for x
    x = 37,992,238,196.39/316,663.72
  6. Step 6: Final answer
    x = 119,976.61

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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.