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Finding the Fourth Proportional to 391,072.42, 539,679.90 and 212,224.42

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Solution

The fourth proportional to 391,072.42, 539,679.90 and 212,224.42 is: 292,869.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,072.42 : 539,679.90 = 212,224.42 : x
  2. Step 2: Convert to fraction form
    391,072.42/539,679.90 = 212,224.42/x
  3. Step 3: Cross multiply
    391,072.42x = 539,679.90 × 212,224.42
  4. Step 4: Simplify right side
    391,072.42x = 114,533,253,763.16
  5. Step 5: Solve for x
    x = 114,533,253,763.16/391,072.42
  6. Step 6: Final answer
    x = 292,869.68

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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.