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Finding the Fourth Proportional to 135,809.70, 203,868.15 and 80,436.90

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Solution

The fourth proportional to 135,809.70, 203,868.15 and 80,436.90 is: 120,746.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,809.70 : 203,868.15 = 80,436.90 : x
  2. Step 2: Convert to fraction form
    135,809.70/203,868.15 = 80,436.90/x
  3. Step 3: Cross multiply
    135,809.70x = 203,868.15 × 80,436.90
  4. Step 4: Simplify right side
    135,809.70x = 16,398,521,994.74
  5. Step 5: Solve for x
    x = 16,398,521,994.74/135,809.70
  6. Step 6: Final answer
    x = 120,746.32

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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.