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Finding the Fourth Proportional to 80,967.40, 121,288.45 and 40,318.45

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Solution

The fourth proportional to 80,967.40, 121,288.45 and 40,318.45 is: 60,396.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,967.40 : 121,288.45 = 40,318.45 : x
  2. Step 2: Convert to fraction form
    80,967.40/121,288.45 = 40,318.45/x
  3. Step 3: Cross multiply
    80,967.40x = 121,288.45 × 40,318.45
  4. Step 4: Simplify right side
    80,967.40x = 4,890,161,498.87
  5. Step 5: Solve for x
    x = 4,890,161,498.87/80,967.40
  6. Step 6: Final answer
    x = 60,396.68

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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.