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Finding the Fourth Proportional to 111,218.80, 166,828.20 and 71,820.40

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Solution

The fourth proportional to 111,218.80, 166,828.20 and 71,820.40 is: 107,730.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,218.80 : 166,828.20 = 71,820.40 : x
  2. Step 2: Convert to fraction form
    111,218.80/166,828.20 = 71,820.40/x
  3. Step 3: Cross multiply
    111,218.80x = 166,828.20 × 71,820.40
  4. Step 4: Simplify right side
    111,218.80x = 11,981,668,055.28
  5. Step 5: Solve for x
    x = 11,981,668,055.28/111,218.80
  6. Step 6: Final answer
    x = 107,730.60

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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.