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Finding the Fourth Proportional to 399,265.20, 550,913.40 and 238,129.20

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Solution

The fourth proportional to 399,265.20, 550,913.40 and 238,129.20 is: 328,575.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,265.20 : 550,913.40 = 238,129.20 : x
  2. Step 2: Convert to fraction form
    399,265.20/550,913.40 = 238,129.20/x
  3. Step 3: Cross multiply
    399,265.20x = 550,913.40 × 238,129.20
  4. Step 4: Simplify right side
    399,265.20x = 131,188,567,211.28
  5. Step 5: Solve for x
    x = 131,188,567,211.28/399,265.20
  6. Step 6: Final answer
    x = 328,575.01

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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.