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Finding the Fourth Proportional to 328,269.11, 492,456.15 and 138,731.31

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Solution

The fourth proportional to 328,269.11, 492,456.15 and 138,731.31 is: 208,119.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,269.11 : 492,456.15 = 138,731.31 : x
  2. Step 2: Convert to fraction form
    328,269.11/492,456.15 = 138,731.31/x
  3. Step 3: Cross multiply
    328,269.11x = 492,456.15 × 138,731.31
  4. Step 4: Simplify right side
    328,269.11x = 68,319,086,807.06
  5. Step 5: Solve for x
    x = 68,319,086,807.06/328,269.11
  6. Step 6: Final answer
    x = 208,119.15

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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.