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Finding the Fourth Proportional to 391,060.82, 539,663.92 and 212,212.82

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Solution

The fourth proportional to 391,060.82, 539,663.92 and 212,212.82 is: 292,853.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,060.82 : 539,663.92 = 212,212.82 : x
  2. Step 2: Convert to fraction form
    391,060.82/539,663.92 = 212,212.82/x
  3. Step 3: Cross multiply
    391,060.82x = 539,663.92 × 212,212.82
  4. Step 4: Simplify right side
    391,060.82x = 114,523,602,315.45
  5. Step 5: Solve for x
    x = 114,523,602,315.45/391,060.82
  6. Step 6: Final answer
    x = 292,853.69

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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.