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Finding the Fourth Proportional to 328,629, 492,945.12 and 79,311

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Solution

The fourth proportional to 328,629, 492,945.12 and 79,311 is: 118,966.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,629 : 492,945.12 = 79,311 : x
  2. Step 2: Convert to fraction form
    328,629/492,945.12 = 79,311/x
  3. Step 3: Cross multiply
    328,629x = 492,945.12 × 79,311
  4. Step 4: Simplify right side
    328,629x = 39,095,970,412.32
  5. Step 5: Solve for x
    x = 39,095,970,412.32/328,629
  6. Step 6: Final answer
    x = 118,966.89

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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.