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Finding the Fourth Proportional to 212,881.80, 319,322.70 and 188,920.20

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Solution

The fourth proportional to 212,881.80, 319,322.70 and 188,920.20 is: 283,380.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,881.80 : 319,322.70 = 188,920.20 : x
  2. Step 2: Convert to fraction form
    212,881.80/319,322.70 = 188,920.20/x
  3. Step 3: Cross multiply
    212,881.80x = 319,322.70 × 188,920.20
  4. Step 4: Simplify right side
    212,881.80x = 60,326,508,348.54
  5. Step 5: Solve for x
    x = 60,326,508,348.54/212,881.80
  6. Step 6: Final answer
    x = 283,380.30

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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.