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Finding the Fourth Proportional to 139,749.64, 209,710.62 and 89,861.56

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Solution

The fourth proportional to 139,749.64, 209,710.62 and 89,861.56 is: 134,847.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,749.64 : 209,710.62 = 89,861.56 : x
  2. Step 2: Convert to fraction form
    139,749.64/209,710.62 = 89,861.56/x
  3. Step 3: Cross multiply
    139,749.64x = 209,710.62 × 89,861.56
  4. Step 4: Simplify right side
    139,749.64x = 18,844,923,461.77
  5. Step 5: Solve for x
    x = 18,844,923,461.77/139,749.64
  6. Step 6: Final answer
    x = 134,847.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.