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Finding the Fourth Proportional to 391,191.12, 539,840.52 and 221,423.76

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Solution

The fourth proportional to 391,191.12, 539,840.52 and 221,423.76 is: 305,562.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,191.12 : 539,840.52 = 221,423.76 : x
  2. Step 2: Convert to fraction form
    391,191.12/539,840.52 = 221,423.76/x
  3. Step 3: Cross multiply
    391,191.12x = 539,840.52 × 221,423.76
  4. Step 4: Simplify right side
    391,191.12x = 119,533,517,738.76
  5. Step 5: Solve for x
    x = 119,533,517,738.76/391,191.12
  6. Step 6: Final answer
    x = 305,562.96

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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.