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Finding the Fourth Proportional to 111,385.80, 167,078.70 and 71,987.40

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Solution

The fourth proportional to 111,385.80, 167,078.70 and 71,987.40 is: 107,981.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,385.80 : 167,078.70 = 71,987.40 : x
  2. Step 2: Convert to fraction form
    111,385.80/167,078.70 = 71,987.40/x
  3. Step 3: Cross multiply
    111,385.80x = 167,078.70 × 71,987.40
  4. Step 4: Simplify right side
    111,385.80x = 12,027,561,208.38
  5. Step 5: Solve for x
    x = 12,027,561,208.38/111,385.80
  6. Step 6: Final answer
    x = 107,981.10

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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.