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Finding the Fourth Proportional to 212,717.80, 319,335.90 and 211,162.60

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Solution

The fourth proportional to 212,717.80, 319,335.90 and 211,162.60 is: 317,001.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,717.80 : 319,335.90 = 211,162.60 : x
  2. Step 2: Convert to fraction form
    212,717.80/319,335.90 = 211,162.60/x
  3. Step 3: Cross multiply
    212,717.80x = 319,335.90 × 211,162.60
  4. Step 4: Simplify right side
    212,717.80x = 67,431,798,917.34
  5. Step 5: Solve for x
    x = 67,431,798,917.34/212,717.80
  6. Step 6: Final answer
    x = 317,001.20

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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.