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Finding the Fourth Proportional to 111,515.20, 167,272.80 and 78,272.80

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Solution

The fourth proportional to 111,515.20, 167,272.80 and 78,272.80 is: 117,409.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,515.20 : 167,272.80 = 78,272.80 : x
  2. Step 2: Convert to fraction form
    111,515.20/167,272.80 = 78,272.80/x
  3. Step 3: Cross multiply
    111,515.20x = 167,272.80 × 78,272.80
  4. Step 4: Simplify right side
    111,515.20x = 13,092,910,419.84
  5. Step 5: Solve for x
    x = 13,092,910,419.84/111,515.20
  6. Step 6: Final answer
    x = 117,409.20

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1.5x scale

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.