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Finding the Fourth Proportional to 90,871.70, 136,048.35 and 80,503.70

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Solution

The fourth proportional to 90,871.70, 136,048.35 and 80,503.70 is: 120,525.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,871.70 : 136,048.35 = 80,503.70 : x
  2. Step 2: Convert to fraction form
    90,871.70/136,048.35 = 80,503.70/x
  3. Step 3: Cross multiply
    90,871.70x = 136,048.35 × 80,503.70
  4. Step 4: Simplify right side
    90,871.70x = 10,952,395,553.90
  5. Step 5: Solve for x
    x = 10,952,395,553.90/90,871.70
  6. Step 6: Final answer
    x = 120,525.92

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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.