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Finding the Fourth Proportional to 391,068, 539,673.84 and 212,220

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Solution

The fourth proportional to 391,068, 539,673.84 and 212,220 is: 292,863.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,068 : 539,673.84 = 212,220 : x
  2. Step 2: Convert to fraction form
    391,068/539,673.84 = 212,220/x
  3. Step 3: Cross multiply
    391,068x = 539,673.84 × 212,220
  4. Step 4: Simplify right side
    391,068x = 114,529,582,324.80
  5. Step 5: Solve for x
    x = 114,529,582,324.80/391,068
  6. Step 6: Final answer
    x = 292,863.60

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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.