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Finding the Fourth Proportional to 318,157.35, 439,052.42 and 172,958.31

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Solution

The fourth proportional to 318,157.35, 439,052.42 and 172,958.31 is: 238,679.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,157.35 : 439,052.42 = 172,958.31 : x
  2. Step 2: Convert to fraction form
    318,157.35/439,052.42 = 172,958.31/x
  3. Step 3: Cross multiply
    318,157.35x = 439,052.42 × 172,958.31
  4. Step 4: Simplify right side
    318,157.35x = 75,937,763,699.82
  5. Step 5: Solve for x
    x = 75,937,763,699.82/318,157.35
  6. Step 6: Final answer
    x = 238,679.90

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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.