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Finding the Fourth Proportional to 259,418.60, 389,127.90 and 72,429.80

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Solution

The fourth proportional to 259,418.60, 389,127.90 and 72,429.80 is: 108,644.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,418.60 : 389,127.90 = 72,429.80 : x
  2. Step 2: Convert to fraction form
    259,418.60/389,127.90 = 72,429.80/x
  3. Step 3: Cross multiply
    259,418.60x = 389,127.90 × 72,429.80
  4. Step 4: Simplify right side
    259,418.60x = 28,184,455,971.42
  5. Step 5: Solve for x
    x = 28,184,455,971.42/259,418.60
  6. Step 6: Final answer
    x = 108,644.70

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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.