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Finding the Fourth Proportional to 391,056, 539,657.28 and 212,208

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Solution

The fourth proportional to 391,056, 539,657.28 and 212,208 is: 292,847.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,056 : 539,657.28 = 212,208 : x
  2. Step 2: Convert to fraction form
    391,056/539,657.28 = 212,208/x
  3. Step 3: Cross multiply
    391,056x = 539,657.28 × 212,208
  4. Step 4: Simplify right side
    391,056x = 114,519,592,074.24
  5. Step 5: Solve for x
    x = 114,519,592,074.24/391,056
  6. Step 6: Final answer
    x = 292,847.04

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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.