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Finding the Fourth Proportional to 111,320.80, 166,981.20 and 66,924.70

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Solution

The fourth proportional to 111,320.80, 166,981.20 and 66,924.70 is: 100,387.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,320.80 : 166,981.20 = 66,924.70 : x
  2. Step 2: Convert to fraction form
    111,320.80/166,981.20 = 66,924.70/x
  3. Step 3: Cross multiply
    111,320.80x = 166,981.20 × 66,924.70
  4. Step 4: Simplify right side
    111,320.80x = 11,175,166,715.64
  5. Step 5: Solve for x
    x = 11,175,166,715.64/111,320.80
  6. Step 6: Final answer
    x = 100,387.05

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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.