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Finding the Fourth Proportional to 312,421.42, 431,141.79 and 169,181.62

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Solution

The fourth proportional to 312,421.42, 431,141.79 and 169,181.62 is: 233,470.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,421.42 : 431,141.79 = 169,181.62 : x
  2. Step 2: Convert to fraction form
    312,421.42/431,141.79 = 169,181.62/x
  3. Step 3: Cross multiply
    312,421.42x = 431,141.79 × 169,181.62
  4. Step 4: Simplify right side
    312,421.42x = 72,941,266,481.90
  5. Step 5: Solve for x
    x = 72,941,266,481.90/312,421.42
  6. Step 6: Final answer
    x = 233,470.76

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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.