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Finding the Fourth Proportional to 212,612.73, 318,930.72 and 86,234.19

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Solution

The fourth proportional to 212,612.73, 318,930.72 and 86,234.19 is: 129,356.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,612.73 : 318,930.72 = 86,234.19 : x
  2. Step 2: Convert to fraction form
    212,612.73/318,930.72 = 86,234.19/x
  3. Step 3: Cross multiply
    212,612.73x = 318,930.72 × 86,234.19
  4. Step 4: Simplify right side
    212,612.73x = 27,502,732,305.32
  5. Step 5: Solve for x
    x = 27,502,732,305.32/212,612.73
  6. Step 6: Final answer
    x = 129,356.00

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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.