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Finding the Fourth Proportional to 210,616.20, 315,924.30 and 68,461.20

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Solution

The fourth proportional to 210,616.20, 315,924.30 and 68,461.20 is: 102,691.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,616.20 : 315,924.30 = 68,461.20 : x
  2. Step 2: Convert to fraction form
    210,616.20/315,924.30 = 68,461.20/x
  3. Step 3: Cross multiply
    210,616.20x = 315,924.30 × 68,461.20
  4. Step 4: Simplify right side
    210,616.20x = 21,628,556,687.16
  5. Step 5: Solve for x
    x = 21,628,556,687.16/210,616.20
  6. Step 6: Final answer
    x = 102,691.80

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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.