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Finding the Fourth Proportional to 391,072.88, 539,680.92 and 212,224.88

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Solution

The fourth proportional to 391,072.88, 539,680.92 and 212,224.88 is: 292,870.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,072.88 : 539,680.92 = 212,224.88 : x
  2. Step 2: Convert to fraction form
    391,072.88/539,680.92 = 212,224.88/x
  3. Step 3: Cross multiply
    391,072.88x = 539,680.92 × 212,224.88
  4. Step 4: Simplify right side
    391,072.88x = 114,533,718,485.29
  5. Step 5: Solve for x
    x = 114,533,718,485.29/391,072.88
  6. Step 6: Final answer
    x = 292,870.52

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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.