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Finding the Fourth Proportional to 91,311.64, 125,972.54 and 55,495.88

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Solution

The fourth proportional to 91,311.64, 125,972.54 and 55,495.88 is: 76,561.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,311.64 : 125,972.54 = 55,495.88 : x
  2. Step 2: Convert to fraction form
    91,311.64/125,972.54 = 55,495.88/x
  3. Step 3: Cross multiply
    91,311.64x = 125,972.54 × 55,495.88
  4. Step 4: Simplify right side
    91,311.64x = 6,990,956,963.14
  5. Step 5: Solve for x
    x = 6,990,956,963.14/91,311.64
  6. Step 6: Final answer
    x = 76,561.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.