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Finding the Fourth Proportional to 287,858.60, 431,399.10 and 254,421.80

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Solution

The fourth proportional to 287,858.60, 431,399.10 and 254,421.80 is: 381,289.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,858.60 : 431,399.10 = 254,421.80 : x
  2. Step 2: Convert to fraction form
    287,858.60/431,399.10 = 254,421.80/x
  3. Step 3: Cross multiply
    287,858.60x = 431,399.10 × 254,421.80
  4. Step 4: Simplify right side
    287,858.60x = 109,757,335,540.38
  5. Step 5: Solve for x
    x = 109,757,335,540.38/287,858.60
  6. Step 6: Final answer
    x = 381,289.06

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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.