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Finding the Fourth Proportional to 391,078.89, 539,688.84 and 212,230.89

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Solution

The fourth proportional to 391,078.89, 539,688.84 and 212,230.89 is: 292,878.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,078.89 : 539,688.84 = 212,230.89 : x
  2. Step 2: Convert to fraction form
    391,078.89/539,688.84 = 212,230.89/x
  3. Step 3: Cross multiply
    391,078.89x = 539,688.84 × 212,230.89
  4. Step 4: Simplify right side
    391,078.89x = 114,538,642,836.27
  5. Step 5: Solve for x
    x = 114,538,642,836.27/391,078.89
  6. Step 6: Final answer
    x = 292,878.61

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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.