Home / 391,189.12-539,837.76-221,421.76

Finding the Fourth Proportional to 391,189.12, 539,837.76 and 221,421.76

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Solution

The fourth proportional to 391,189.12, 539,837.76 and 221,421.76 is: 305,560.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,189.12 : 539,837.76 = 221,421.76 : x
  2. Step 2: Convert to fraction form
    391,189.12/539,837.76 = 221,421.76/x
  3. Step 3: Cross multiply
    391,189.12x = 539,837.76 × 221,421.76
  4. Step 4: Simplify right side
    391,189.12x = 119,531,826,933.66
  5. Step 5: Solve for x
    x = 119,531,826,933.66/391,189.12
  6. Step 6: Final answer
    x = 305,560.20

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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.