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Finding the Fourth Proportional to 210,654.80, 315,979.12 and 68,506.62

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Solution

The fourth proportional to 210,654.80, 315,979.12 and 68,506.62 is: 102,758.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,654.80 : 315,979.12 = 68,506.62 : x
  2. Step 2: Convert to fraction form
    210,654.80/315,979.12 = 68,506.62/x
  3. Step 3: Cross multiply
    210,654.80x = 315,979.12 × 68,506.62
  4. Step 4: Simplify right side
    210,654.80x = 21,646,661,501.77
  5. Step 5: Solve for x
    x = 21,646,661,501.77/210,654.80
  6. Step 6: Final answer
    x = 102,758.93

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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.