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Finding the Fourth Proportional to 111,915.80, 167,873.70 and 99,668.60

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Solution

The fourth proportional to 111,915.80, 167,873.70 and 99,668.60 is: 149,502.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,915.80 : 167,873.70 = 99,668.60 : x
  2. Step 2: Convert to fraction form
    111,915.80/167,873.70 = 99,668.60/x
  3. Step 3: Cross multiply
    111,915.80x = 167,873.70 × 99,668.60
  4. Step 4: Simplify right side
    111,915.80x = 16,731,736,655.82
  5. Step 5: Solve for x
    x = 16,731,736,655.82/111,915.80
  6. Step 6: Final answer
    x = 149,502.90

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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.