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Finding the Fourth Proportional to 111,647.40, 167,613.21 and 72,368.88

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Solution

The fourth proportional to 111,647.40, 167,613.21 and 72,368.88 is: 108,645.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,647.40 : 167,613.21 = 72,368.88 : x
  2. Step 2: Convert to fraction form
    111,647.40/167,613.21 = 72,368.88/x
  3. Step 3: Cross multiply
    111,647.40x = 167,613.21 × 72,368.88
  4. Step 4: Simplify right side
    111,647.40x = 12,129,980,280.90
  5. Step 5: Solve for x
    x = 12,129,980,280.90/111,647.40
  6. Step 6: Final answer
    x = 108,645.43

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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.