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Finding the Fourth Proportional to 391,111, 539,733.18 and 212,263

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Solution

The fourth proportional to 391,111, 539,733.18 and 212,263 is: 292,922.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,111 : 539,733.18 = 212,263 : x
  2. Step 2: Convert to fraction form
    391,111/539,733.18 = 212,263/x
  3. Step 3: Cross multiply
    391,111x = 539,733.18 × 212,263
  4. Step 4: Simplify right side
    391,111x = 114,565,383,986.34
  5. Step 5: Solve for x
    x = 114,565,383,986.34/391,111
  6. Step 6: Final answer
    x = 292,922.94

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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.