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Finding the Fourth Proportional to 391,099.54, 539,703.66 and 221,330.02

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Solution

The fourth proportional to 391,099.54, 539,703.66 and 221,330.02 is: 305,427.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,099.54 : 539,703.66 = 221,330.02 : x
  2. Step 2: Convert to fraction form
    391,099.54/539,703.66 = 221,330.02/x
  3. Step 3: Cross multiply
    391,099.54x = 539,703.66 × 221,330.02
  4. Step 4: Simplify right side
    391,099.54x = 119,452,621,861.87
  5. Step 5: Solve for x
    x = 119,452,621,861.87/391,099.54
  6. Step 6: Final answer
    x = 305,427.67

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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.