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Finding the Fourth Proportional to 399,211.20, 550,864.80 and 238,075.20

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Solution

The fourth proportional to 399,211.20, 550,864.80 and 238,075.20 is: 328,515.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,211.20 : 550,864.80 = 238,075.20 : x
  2. Step 2: Convert to fraction form
    399,211.20/550,864.80 = 238,075.20/x
  3. Step 3: Cross multiply
    399,211.20x = 550,864.80 × 238,075.20
  4. Step 4: Simplify right side
    399,211.20x = 131,147,247,432.96
  5. Step 5: Solve for x
    x = 131,147,247,432.96/399,211.20
  6. Step 6: Final answer
    x = 328,515.95

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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.