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Finding the Fourth Proportional to 139,689.84, 209,201.23 and 80,400.88

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Solution

The fourth proportional to 139,689.84, 209,201.23 and 80,400.88 is: 120,409.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,689.84 : 209,201.23 = 80,400.88 : x
  2. Step 2: Convert to fraction form
    139,689.84/209,201.23 = 80,400.88/x
  3. Step 3: Cross multiply
    139,689.84x = 209,201.23 × 80,400.88
  4. Step 4: Simplify right side
    139,689.84x = 16,819,962,989.08
  5. Step 5: Solve for x
    x = 16,819,962,989.08/139,689.84
  6. Step 6: Final answer
    x = 120,409.35

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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.