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Finding the Fourth Proportional to 90,810.70, 135,956.85 and 80,442.70

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Solution

The fourth proportional to 90,810.70, 135,956.85 and 80,442.70 is: 120,434.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,810.70 : 135,956.85 = 80,442.70 : x
  2. Step 2: Convert to fraction form
    90,810.70/135,956.85 = 80,442.70/x
  3. Step 3: Cross multiply
    90,810.70x = 135,956.85 × 80,442.70
  4. Step 4: Simplify right side
    90,810.70x = 10,936,736,097.50
  5. Step 5: Solve for x
    x = 10,936,736,097.50/90,810.70
  6. Step 6: Final answer
    x = 120,434.44

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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.