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Finding the Fourth Proportional to 389,915.06, 538,082.88 and 211,067.06

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Solution

The fourth proportional to 389,915.06, 538,082.88 and 211,067.06 is: 291,272.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,915.06 : 538,082.88 = 211,067.06 : x
  2. Step 2: Convert to fraction form
    389,915.06/538,082.88 = 211,067.06/x
  3. Step 3: Cross multiply
    389,915.06x = 538,082.88 × 211,067.06
  4. Step 4: Simplify right side
    389,915.06x = 113,571,571,517.93
  5. Step 5: Solve for x
    x = 113,571,571,517.93/389,915.06
  6. Step 6: Final answer
    x = 291,272.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.