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Finding the Fourth Proportional to 121,898.96, 168,183.24 and 79,442

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Solution

The fourth proportional to 121,898.96, 168,183.24 and 79,442 is: 109,605.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,898.96 : 168,183.24 = 79,442 : x
  2. Step 2: Convert to fraction form
    121,898.96/168,183.24 = 79,442/x
  3. Step 3: Cross multiply
    121,898.96x = 168,183.24 × 79,442
  4. Step 4: Simplify right side
    121,898.96x = 13,360,812,952.08
  5. Step 5: Solve for x
    x = 13,360,812,952.08/121,898.96
  6. Step 6: Final answer
    x = 109,605.64

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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.