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Finding the Fourth Proportional to 391,078.88, 539,688.85 and 212,230.88

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Solution

The fourth proportional to 391,078.88, 539,688.85 and 212,230.88 is: 292,878.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,078.88 : 539,688.85 = 212,230.88 : x
  2. Step 2: Convert to fraction form
    391,078.88/539,688.85 = 212,230.88/x
  3. Step 3: Cross multiply
    391,078.88x = 539,688.85 × 212,230.88
  4. Step 4: Simplify right side
    391,078.88x = 114,538,639,561.69
  5. Step 5: Solve for x
    x = 114,538,639,561.69/391,078.88
  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.