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Finding the Fourth Proportional to 289,245.80, 399,147.54 and 168,390.56

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Solution

The fourth proportional to 289,245.80, 399,147.54 and 168,390.56 is: 232,372.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,245.80 : 399,147.54 = 168,390.56 : x
  2. Step 2: Convert to fraction form
    289,245.80/399,147.54 = 168,390.56/x
  3. Step 3: Cross multiply
    289,245.80x = 399,147.54 × 168,390.56
  4. Step 4: Simplify right side
    289,245.80x = 67,212,677,783.22
  5. Step 5: Solve for x
    x = 67,212,677,783.22/289,245.80
  6. Step 6: Final answer
    x = 232,372.18

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1.5x scale

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.