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Finding the Fourth Proportional to 139,495.45, 209,247.55 and 66,449.76

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Solution

The fourth proportional to 139,495.45, 209,247.55 and 66,449.76 is: 99,676.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,495.45 : 209,247.55 = 66,449.76 : x
  2. Step 2: Convert to fraction form
    139,495.45/209,247.55 = 66,449.76/x
  3. Step 3: Cross multiply
    139,495.45x = 209,247.55 × 66,449.76
  4. Step 4: Simplify right side
    139,495.45x = 13,904,449,478.09
  5. Step 5: Solve for x
    x = 13,904,449,478.09/139,495.45
  6. Step 6: Final answer
    x = 99,676.72

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1.5x scale

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.