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Finding the Fourth Proportional to 391,086.38, 539,699.20 and 212,238.38

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Solution

The fourth proportional to 391,086.38, 539,699.20 and 212,238.38 is: 292,888.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,086.38 : 539,699.20 = 212,238.38 : x
  2. Step 2: Convert to fraction form
    391,086.38/539,699.20 = 212,238.38/x
  3. Step 3: Cross multiply
    391,086.38x = 539,699.20 × 212,238.38
  4. Step 4: Simplify right side
    391,086.38x = 114,544,881,196.80
  5. Step 5: Solve for x
    x = 114,544,881,196.80/391,086.38
  6. Step 6: Final answer
    x = 292,888.96

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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.