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Finding the Fourth Proportional to 139,062.44, 191,835.50 and 87,989.06

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Solution

The fourth proportional to 139,062.44, 191,835.50 and 87,989.06 is: 121,380.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,062.44 : 191,835.50 = 87,989.06 : x
  2. Step 2: Convert to fraction form
    139,062.44/191,835.50 = 87,989.06/x
  3. Step 3: Cross multiply
    139,062.44x = 191,835.50 × 87,989.06
  4. Step 4: Simplify right side
    139,062.44x = 16,879,425,319.63
  5. Step 5: Solve for x
    x = 16,879,425,319.63/139,062.44
  6. Step 6: Final answer
    x = 121,380.19

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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.