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Finding the Fourth Proportional to 212,718.60, 319,077.90 and 207,469.80

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Solution

The fourth proportional to 212,718.60, 319,077.90 and 207,469.80 is: 311,204.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,718.60 : 319,077.90 = 207,469.80 : x
  2. Step 2: Convert to fraction form
    212,718.60/319,077.90 = 207,469.80/x
  3. Step 3: Cross multiply
    212,718.60x = 319,077.90 × 207,469.80
  4. Step 4: Simplify right side
    212,718.60x = 66,199,028,097.42
  5. Step 5: Solve for x
    x = 66,199,028,097.42/212,718.60
  6. Step 6: Final answer
    x = 311,204.70

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1.5x scale

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.