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Finding the Fourth Proportional to 218,665.20, 301,748.65 and 121,863.90

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Solution

The fourth proportional to 218,665.20, 301,748.65 and 121,863.90 is: 168,166.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,665.20 : 301,748.65 = 121,863.90 : x
  2. Step 2: Convert to fraction form
    218,665.20/301,748.65 = 121,863.90/x
  3. Step 3: Cross multiply
    218,665.20x = 301,748.65 × 121,863.90
  4. Step 4: Simplify right side
    218,665.20x = 36,772,267,004.08
  5. Step 5: Solve for x
    x = 36,772,267,004.08/218,665.20
  6. Step 6: Final answer
    x = 168,166.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.