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Finding the Fourth Proportional to 90,019.91, 135,114.62 and 45,678.48

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Solution

The fourth proportional to 90,019.91, 135,114.62 and 45,678.48 is: 68,560.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,019.91 : 135,114.62 = 45,678.48 : x
  2. Step 2: Convert to fraction form
    90,019.91/135,114.62 = 45,678.48/x
  3. Step 3: Cross multiply
    90,019.91x = 135,114.62 × 45,678.48
  4. Step 4: Simplify right side
    90,019.91x = 6,171,830,238.99
  5. Step 5: Solve for x
    x = 6,171,830,238.99/90,019.91
  6. Step 6: Final answer
    x = 68,560.73

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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.