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Finding the Fourth Proportional to 212,910.88, 319,384.56 and 55,137.28

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Solution

The fourth proportional to 212,910.88, 319,384.56 and 55,137.28 is: 82,710.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,910.88 : 319,384.56 = 55,137.28 : x
  2. Step 2: Convert to fraction form
    212,910.88/319,384.56 = 55,137.28/x
  3. Step 3: Cross multiply
    212,910.88x = 319,384.56 × 55,137.28
  4. Step 4: Simplify right side
    212,910.88x = 17,609,995,912.40
  5. Step 5: Solve for x
    x = 17,609,995,912.40/212,910.88
  6. Step 6: Final answer
    x = 82,710.64

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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.