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Finding the Fourth Proportional to 139,734.72, 209,339.64 and 108,416.88

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Solution

The fourth proportional to 139,734.72, 209,339.64 and 108,416.88 is: 162,421.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,734.72 : 209,339.64 = 108,416.88 : x
  2. Step 2: Convert to fraction form
    139,734.72/209,339.64 = 108,416.88/x
  3. Step 3: Cross multiply
    139,734.72x = 209,339.64 × 108,416.88
  4. Step 4: Simplify right side
    139,734.72x = 22,695,950,629.12
  5. Step 5: Solve for x
    x = 22,695,950,629.12/139,734.72
  6. Step 6: Final answer
    x = 162,421.70

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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.