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Finding the Fourth Proportional to 139,989.84, 209,650.23 and 76,714.80

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Solution

The fourth proportional to 139,989.84, 209,650.23 and 76,714.80 is: 114,888.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,989.84 : 209,650.23 = 76,714.80 : x
  2. Step 2: Convert to fraction form
    139,989.84/209,650.23 = 76,714.80/x
  3. Step 3: Cross multiply
    139,989.84x = 209,650.23 × 76,714.80
  4. Step 4: Simplify right side
    139,989.84x = 16,083,275,464.40
  5. Step 5: Solve for x
    x = 16,083,275,464.40/139,989.84
  6. Step 6: Final answer
    x = 114,888.88

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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.