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Finding the Fourth Proportional to 111,911.60, 168,061.80 and 108,412.40

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Solution

The fourth proportional to 111,911.60, 168,061.80 and 108,412.40 is: 162,806.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,911.60 : 168,061.80 = 108,412.40 : x
  2. Step 2: Convert to fraction form
    111,911.60/168,061.80 = 108,412.40/x
  3. Step 3: Cross multiply
    111,911.60x = 168,061.80 × 108,412.40
  4. Step 4: Simplify right side
    111,911.60x = 18,219,983,086.32
  5. Step 5: Solve for x
    x = 18,219,983,086.32/111,911.60
  6. Step 6: Final answer
    x = 162,806.92

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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.