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Finding the Fourth Proportional to 647,443.20, 971,164.80 and 395,500.80

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Solution

The fourth proportional to 647,443.20, 971,164.80 and 395,500.80 is: 593,251.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,443.20 : 971,164.80 = 395,500.80 : x
  2. Step 2: Convert to fraction form
    647,443.20/971,164.80 = 395,500.80/x
  3. Step 3: Cross multiply
    647,443.20x = 971,164.80 × 395,500.80
  4. Step 4: Simplify right side
    647,443.20x = 384,096,455,331.84
  5. Step 5: Solve for x
    x = 384,096,455,331.84/647,443.20
  6. Step 6: Final answer
    x = 593,251.20

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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.