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Finding the Fourth Proportional to 388,722.85, 583,163.55 and 220,318.38

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Solution

The fourth proportional to 388,722.85, 583,163.55 and 220,318.38 is: 330,522.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,722.85 : 583,163.55 = 220,318.38 : x
  2. Step 2: Convert to fraction form
    388,722.85/583,163.55 = 220,318.38/x
  3. Step 3: Cross multiply
    388,722.85x = 583,163.55 × 220,318.38
  4. Step 4: Simplify right side
    388,722.85x = 128,481,648,611.05
  5. Step 5: Solve for x
    x = 128,481,648,611.05/388,722.85
  6. Step 6: Final answer
    x = 330,522.50

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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.