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Finding the Fourth Proportional to 90,730.32, 135,994.63 and 68,471.52

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Solution

The fourth proportional to 90,730.32, 135,994.63 and 68,471.52 is: 102,631.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,730.32 : 135,994.63 = 68,471.52 : x
  2. Step 2: Convert to fraction form
    90,730.32/135,994.63 = 68,471.52/x
  3. Step 3: Cross multiply
    90,730.32x = 135,994.63 × 68,471.52
  4. Step 4: Simplify right side
    90,730.32x = 9,311,759,027.94
  5. Step 5: Solve for x
    x = 9,311,759,027.94/90,730.32
  6. Step 6: Final answer
    x = 102,631.17

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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.